EWorld Grade3 Notes Questions and Answer Kids ICT Classes Sri Lanka Online International School Syllabus Books

🗄️ TASK 1: STORE – Save Your Data

📦 Internal vs External Storage

• Internal Storage: Computers store data in an internal hard disk drive (usually called the "C: drive").
• External Storage: Used when data is too large for internal storage.
• Common Storage Devices: Hard disk drive, CD / DVD, USB flash memory, Memory card.

💾 Specific Storage Devices

🔹 External Hard Disk

• Most common data storage device
• Biggest storage space available
• Can store ~1,000 movies or 1 million songs

🔹 CD / DVD

• CD (Compact Disc): Store documents, music, photos (not enough space for movies)
• DVD (Digital Versatile Disc): Evolution of CDs with much more space (~5 movies per disc)

⚠️ Warning: Be careful not to scratch the surface, or data will be lost!

🔹 USB Flash Memory

• Store/transfer data between computers or smartphones
• Very cheap, damage-resistant, various sizes
• Portable – carry on a keychain
• Nickname: "Memory stick"

🔹 Memory Card

• Very thin and small
• Used with smartphones, digital cameras, MP3 players, game consoles
• Transfer data from devices to PC/laptop

📜 History Fact: In the 70s and 80s, the main storage device was the floppy disk – thin, flexible magnetic disks. They are now obsolete due to very small storage capacity.

🖨️ TASK 2: PRINT – From Screen to Paper

📄 Printer Basics

• Definition: A printer outputs text, numbers, images, or photos from your screen onto paper.
• Connection: Usually connected via USB cable.
• Requirements:
  • Computer must be connected to printer
  • Printer must be turned on
• Materials: Print on various paper sizes, stickers, or envelopes.

🖨️ Types of Printers

✨ Inkjet Printer

• Most common type
• Uses 4 inks: cyan, yellow, magenta, black
• Sprays ink drops to create images
• Very affordable printers
• Needs special photo paper for perfect photos

⚡ Laser Printer

• Uses laser rays for printing
• Very high speed & print quality
• Now available in color (was B&W only)
• More expensive than inkjet
• Prints hundreds of pages very fast

🧾 Thermal Printer

• Found in shops, supermarkets, restaurants
• Prints receipts on special long, narrow paper
• Usually prints black text only

🏗️ Professional Printers

• Dot Matrix: Oldest type; prints multiple copies simultaneously but low quality (rarely used now)
• Plotter: Biggest printer type; used for architectural plans & large banners; evolved from pen-based to inkjet

💡 Smart Tip: Recycle paper, ink, and toner cartridges to protect the planet. Refill empty ink cartridges to save money!

❓ Hands On! – Quick Quiz

• ✅ If you were an architect, you would use a plotter.
• ❌ An inkjet printer uses cyan, yellow, magenta, and black (not just black, white, red).
• ✅ You can print many copies at once using a dot matrix printer.
• ✅ A laser printer is more expensive than an inkjet printer.
• ✅ Shops print receipts using thermal printers.
• ❌ Inkjet printers are cheap to buy, but their ink can be expensive.
• ✅ High-quality printing is a feature of laser printers.

🎥 Video Camera

• Definition: A recording device used to capture motion pictures.
• Storage Evolution:
  • Past: Videotapes and optical discs
  • Present: Memory cards (easy transfer to computers)
• Device Evolution:
  • First cameras: Big, heavy, low quality
  • Modern cameras: Small, easy to use, record hours on tiny cards, some support night recording
• Uses: Daily moments, celebrations, TV/film production, scientific events, spacecraft equipment.

📜 History Fact: John Logie Baird created the first video cameras, and the BBC used them in experimental broadcasts in the 1930s.

🎙️ TASK 3: CAPTURE – Capture the Present, Preserve for the Future

🎤 Microphone

• Function: Captures sound waves (like your voice) and converts them to digital form
• Usage: Recordings saved as audio files for later listening or emailing
• Applications: Telephones, smartphones, video recorders, karaoke, movie production, radio/TV
• Chatting: Use mic to speak + headphones to listen when video calling

📹 Web Camera (Webcam)

• Function: Feeds live video/images into a computer in real time
• Capabilities: Record clips, save, email, or upload to Internet
• Features: Many have integrated mics; some wireless; built into many laptops/monitors
• Advanced Uses:
  • "Magic Mirror" for virtual try-ons
  • Telecommuting / remote work
  • Security cameras

🌐 Named after the World Wide Web – mostly used when online!

📷 Digital Camera

• Function: Image capture device for high-definition photos
• Technology: No film – preview photos instantly on screen
• Storage: Uses memory cards
• Nickname: "Digicam"
• Workflow: Transfer to computer via memory card for editing
• Modern Integration: Built into smartphones & tablets for casual "snapshot" photography + video/audio

🎯 Hands On! – Activities & Matching

Device	Best Used For
🎤 Microphone	Recording your voice
🎥 Video Camera	Capturing events like a birthday party
📹 Webcam	Video calling a friend
📷 Digital Camera	Taking photographs on your holiday

💭 Reflection Questions

• Which of these capture devices do you have at home?
• Which of these capture devices do you have at school?

🧠 Quick Storage Quiz

• To transfer a game from computer to tablet → Memory card
• DVDs are the evolution of → CDs
• Easiest ways to store data → Memory cards, USB flash, or CDs
• To store a movie → External hard disk drive (CDs lack space)
• Inside a digital camera you'll find → Memory card

📚 Study Tip: Review each device's purpose, advantages, and real-world applications for better retention!

🚀 Master GCE O/L A/L ICT | Your IT Degree with Expert Guidance!

Online Individual & Group Classes in English | Sinhala | Tamil

Struggling with assignments, projects, or exams? Get personalized support tailored for BIT (University of Moratuwa), UCSC, and other IT degree students in Sri Lanka.

✨ What You'll Get

• ✅ Live Online Classes (Individual or Group)
• ✅ Sample Projects & Assignments (PHP, MySQL, Java, Python, Web Dev)
• ✅ Past Exam Papers + Model Answers
• ✅ Easy-to-Follow Tutorials & Study Notes
• ✅ Final Year Project Guidance – From Idea to Implementation
• ✅ Doubt-Clearing Sessions & Exam Prep Strategies

🌍 Taught in Your Preferred Language

English | Sinhala | Tamil

📞 Get Started Today!

Call / WhatsApp: +94 72 962 2034

Email: itclasssl@gmail.com

Quick response guaranteed! Share your syllabus or project topic, and we'll craft a learning plan just for you.

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© 2026 IT Classes SL | Empowering Sri Lankan IT Students, One Lesson at a Time 🇱🇰

K-Map Simplification Guide GCE AL ICT | Unit 4 | Boolean Logic and Digital Circuit | English Tamil Medium Online Classes Sri Lanka

🎓 K-Map Simplification Guide

AL ICT | Unit 4 | Boolean Logic and Digital Circuit | English Medium

📚 What is a K-Map?

A Karnaugh Map (K-Map) is a visual method to simplify Boolean algebra expressions. It helps you minimize logic circuits by grouping adjacent cells.

💡 Key Concepts:

• SOP (Sum of Products): Group all 1s in the K-map
• POS (Product of Sums): Group all 0s in the K-map
• Always group in powers of 2: 1, 2, 4, 8, 16...
• Groups can wrap around edges!

Example 1: POS Method (Product of Sums)

F = (A + B' + C + D') · (C)

Step-by-Step Solution:

1 Identify the Form: This is in POS (Product of Sums) form because we have products (·) of sum terms.

2 Convert to Binary:

F = (0 1 0 1) · (0)
Where: A=0, B'=1, C=0, D'=1 for first term
C=0 for second term

3 Fill the K-Map: For POS, we mark 0s where the function is false.

AB \ CD	00	01	11	10
00	0	0	0	0
01	0	0	0	0
11	0	0	1	0
10	0	0	0	0

4 Group the 0s: We can group ALL zeros together because C=0 in all cases.

5 Write Simplified Function:

Result: F = C
Explanation: A, B, and D are changing in the group, but C remains constant (C=0), so F = C

📝 Note: In SOP method, we would group 1s instead, but we'd get the same result: F = C

Example 2: SOP Method (Sum of Products)

F = (A'C'D) + (A'BD) + (BCD) + (ABC) + (ACD')

Step-by-Step Solution:

1 Convert to Binary Values:

F = (001) + (011) + (111) + (111) + (110)
Note: If variable not defined, check with 0 and 1

2 Fill the K-Map with 1s:

AB \ CD	00	01	11	10
00	0	1	1	0
01	0	0	1	0
11	0	1	1	1
10	0	0	0	0

3 Group the 1s (SOP Method):

• Group 1: A'C'D (cells with A=0, C=0, D=1)
• Group 2: BCD (cells with B=1, C=1, D=1)
• Group 3: ACD' (cells with A=1, C=1, D=0)

4 Final Simplified SOP:

F = A'C'D + BCD + ACD'

5 POS Method (Group 0s):

F = (A' + C) · (A + D) · (B + C' + D')

Example 3: Special Cases - All 1s or All 0s

F = (A·B) + (AB') + (A'B) + (A'B')

1 Convert to Binary:

F = (00) + (01) + (10) + (11)
This covers ALL possible combinations!

2 Fill K-Map:

A \ B	0	1
0	1	1
1	1	1

Result: Since ALL cells are 1, F = 1 (always true)
Rule: If all cells are 0, then F = 0 (always false)

🌟 K-Map Don't Care Condition

Real-World Example: Street Light Control

Problem: Street light should be ON when it's Night OR when the environment gets darker.

Variables:

• X = Night time (1 = night, 0 = day)
• Y = Environment dark (1 = dark, 0 = bright)
• Z = Light output (1 = ON, 0 = OFF)

1 Create Truth Table:

X (Night)	Y (Dark)	Z (Light)	Remark
0	0	0	Day + Bright = OFF
0	1	1	Day + Dark = ON
1	0	1	Night + Bright = ON
1	1	1	Night + Dark = ON

2 Initial Function:

Z = X + Y

Z is NOT dependent on certain conditions - this creates "Don't Care" situations.

3 Don't Care Scenario:

Example: In Asian countries near the equator, it's always bright during the day.
So we can remove X (night variable) in some cases.
Simplified: Z = Y (only depends on darkness)

4 K-Map with Don't Care (X):

X \ Y	0	1
0	0	1
1	1	X

X = Don't Care (can be 0 or 1, whichever helps simplification)

✅ Advantages of Don't Care Conditions:

• Greater Simplification: More flexibility in grouping
• Reduced Circuit Cost: Fewer gates needed
• Optimization: Can choose 0 or 1 to make larger groups
• Unused States: Handles impossible input combinations
• Better Performance: Simpler circuits = faster operation

⚠️ Common Issues in K-Maps

Issue 1: Incorrect Grouping

Example: F = (A'B') + (AB) + (B'C')

1 Problem: Students often make these mistakes:

• ❌ Grouping non-adjacent cells
• ❌ Not grouping in powers of 2
• ❌ Missing overlapping groups
• ❌ Not making groups as large as possible

2 Correct Approach:

Original: F = (A'B') + (AB) + (B'C')
Alternative: F = (A'B') + (AB) + (AC')

Both are valid, but check which gives better simplification!

Issue 2: Matrix Size Problems

Example: 2×2 and 2×8 matrices

F = (A'D) + (A'B'C) + (BC'D) + (B'CD)

1 Common Problems:

• Difficulty visualizing 4-variable maps
• Confusion with Gray code ordering (00, 01, 11, 10)
• Missing wrap-around groupings
• Not getting minimized simplification

💡 Solution Tips:

1. Always use Gray code sequence for labeling
2. Remember: edges wrap around (top-bottom, left-right)
3. Make largest possible groups first
4. Allow overlapping groups if needed
5. Verify your answer with Boolean algebra

📋 Quick Reference Guide

SOP (Sum of Products)

• Group all 1s
• Result is OR of AND terms
• Example: F = AB + CD + EF
• Use when output is mostly 1

POS (Product of Sums)

• Group all 0s
• Result is AND of OR terms
• Example: F = (A+B)(C+D)
• Use when output is mostly 0

Grouping Rules:

Group Size	Variables Eliminated	Example
1 cell	0 variables	ABC (no simplification)
2 cells	1 variable	AB (C eliminated)
4 cells	2 variables	A (B,C eliminated)
8 cells	3 variables	1 (all eliminated)

🎯 Practice Tips for Beginners

1 Start Simple: Begin with 2-variable K-maps before moving to 3 or 4 variables.

2 Check Your Work: Always verify simplified expression with truth table.

3 Look for Patterns: Practice recognizing common groupings quickly.

4 Use Don't Cares: Mark X's clearly and use them strategically.

5 Double-Check: Ensure all 1s (or 0s) are covered in your groups.

🎓 You're Ready to Master K-Maps!

Practice with different examples and soon you'll simplify Boolean expressions like a pro!

🚀 Master GCE O/L A/L ICT | Your IT Degree with Expert Guidance!

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• ✅ Live Online Classes (Individual or Group)
• ✅ Sample Projects & Assignments (PHP, MySQL, Java, Python, Web Dev)
• ✅ Past Exam Papers + Model Answers
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© 2026 IT Classes SL | Empowering Sri Lankan IT Students, One Lesson at a Time 🇱🇰

EduManage Pro LMS - Master System Documentation Learning Management System Project Proposal Interim Report Source Code Test Cases Use Diagram BIT UCSC UoM

EduManage Pro LMS - Master System Documentation

Version: 5.0 (Consolidated & Final)
System: EduManage Pro Learning Management System
Stack: PHP (8.x), MySQL, Vanilla CSS/Bootstrap

DB: DB
UI: UI
System: User Mgt

---

1. System Overview & Philosophy

EduManage Pro is a modular, web-based Learning Management System (LMS) designed to manage users, courses, assignments, assessments, and communication. It utilizes an Object-Oriented Programming (OOP) approach with a Modular MVC-Lite architecture.

Core Philosophy

1. Modular Design: Features are self-contained within specific module folders (e.g., modules/course/, modules/user/).
2. Separation of Concerns:
   • UI (View): PHP files rendering HTML/Bootstrap.
   • Actions (Controller): Scripts handling data logic and form processing.
   • Classes (Model): Business logic and database interaction.
3. Security by Design: Implementation of PDO prepared statements, Bcrypt encryption, and Role-Based Access Control (RBAC).
4. Role-Based Access: System access is controlled based on user roles (Admin, Teacher, Student, Parent).

2. Architecture & Design Pattern

The system follows a Model-View-Controller (MVC) Lite pattern tailored for PHP.

Architectural Layers

• The Data Layer (Model): Located in includes/classes/. Each file represents a real-world entity (e.g., User.php, Course.php).
• The Logic Layer (Controller): Located in modules/[module]/actions/. These scripts process form submissions (POST requests) and interact with the Classes.
• The Presentation Layer (View): Located in the module root folders. These are the PHP files rendered in the browser.

Fundamental Data Flow

1. Request: User interacts with a UI file (e.g., form.php).
2. Action: Form submits data to an action script (e.g., save_action.php).
3. Class: Action script instantiates a Class and calls a method (e.g., Course->update()).
4. Database: Class uses PDO to execute SQL on MySQL.
5. Response: User is redirected back to a UI file with a status message.

Diagram Note: The following Mermaid code represents the General Request Lifecycle. To visualize this, copy the code into a Mermaid live editor or ensure your Blogger theme supports Mermaid JS.

sequenceDiagram
    participant User
    participant UI as View (modules/course/form.php)
    participant Action as Controller (actions/save_action.php)
    participant Class as Model (includes/classes/Course.php)
    participant DB as Database (MySQL)

    User->>UI: Fills Form & Clicks Submit
    UI->>Action: POST Data
    Action->>Action: Validate Input & Check Permissions
    Action->>Class: Instantiate Course($db) & Call create()/update()
    Class->>DB: Execute PDO Prepared Statement
    DB-->>Class: Return Result
    Class-->>Action: Return Success/Failure
    Action->>UI: Redirect (header("Location: ..."))
    UI-->>User: Display Success Message

3. Global Directory Structure

The project is organized into four main directories:

Directory	Purpose
assets/	Static files: Global CSS (style.css), JavaScript libraries, and Icons.
includes/	The Core: Database connection, Header/Footer/Sidebar, and Core Classes (classes/).
modules/	The Features: Every system feature (Course, Student, User, etc.) has its own sub-directory here.
uploads/	Storage: Sub-folders for avatars, course materials, assignment submissions, and recordings.

Key Files in includes/

1. header.php: Included in every page. Initializes sessions, database connection ($db), and checks user permissions via the Role class.
2. sidebar.php: Generates the navigation menu dynamically based on $_SESSION['user_role_id'].
3. footer.php: Standardized page footer and JavaScript inclusions.
4. classes/: Contains PHP classes handling business logic.

4. Core Classes (includes/classes/)

These files contain the business logic. For every major feature, there is a corresponding class.

Class File	Purpose
Database.php	Singleton-style PDO connection management.
User.php	Authentication, registration, profile updates, and encryption.
Course.php	CRUD for courses, instructors, and module synchronization.
Assessment.php	Base class for quizzes and assignments.
Quiz.php	Handles quiz creation, questions, and attempt submissions.
Assignment.php	Manages assignment creation and file attachments.
Gradebook.php	Central logic for retrieving and saving student scores.
Enrollment.php	Connects students to courses; tracks status.
Analytics.php	Aggregates system-wide data for dashboard visualization.
LiveClass.php	Handles scheduling and recording links for live sessions.
Message.php	Logic for private messages and forum threads/posts.
Guardian.php	Manages the student-parent relationship.
Role.php	Manages permissions and feature access for user types.

5. Module Breakdown (Granular Guide)

Each module follows a consistent structure: UI Files (Views) and Action Files (Controllers).

A. User Management (modules/user/)

Responsible for accounts, authentication, and role-based access.

• UI Files: login.php, register.php, users.php, user_view.php, user_edit.php, roles.php, import.php, manage_children.php.
• Action Files: user_register.php, user_update.php, user_delete.php (Soft delete), role_action.php, import_action.php, manage_children_action.php.

B. Course Management (modules/course/)

The core of the LMS—where teachers build their classes.

• UI Files: courses.php, form.php, materials.php, enrollment.php.
• Action Files: add_course_action.php, update_course_action.php, delete_course_action.php, enroll_student_action.php, upload_material_action.php.

C. Assessment & Grading (modules/assessment/)

Handles quizzes, assignments, and the gradebook.

• UI Files: assignments.php, quizzes.php, gradebook.php.
• Action Files: create_assignment_action.php, create_quiz_action.php, save_grade_action.php.

D. Communication (modules/communication/)

• UI Files: messages.php, forums.php, announcements.php.
• Action Files: send_message.php, create_thread.php, create_announcement.php.

E. Classroom (modules/classroom/)

• UI Files: live.php, recordings.php.
• Action Files: schedule_class_action.php, update_recording_action.php.

F. Student & Parent Portals

• Student (modules/student/): dashboard.php, course_view.php, take_quiz.php, submit_assignment.php.
• Parent (modules/parent/): progress.php, communication.php.

6. Data Flow & Engineering

Technical Deep Dive: User Registration Flow

This section details the specific engineering behind user registration, highlighting security and data integrity.

Diagram Note: Copy the code below into a Mermaid renderer to visualize the User Registration Flow.

flowchart TD
    A[User fills register.php] -->|POST Data| B[actions/user_register.php]
    B --> C{Validation Check}
    C -->|Fail| D[Return Error JSON]
    C -->|Pass| E[Check Uniqueness]
    E -->|Email Exists| D
    E -->|Unique| F[Call User->register($data)]
    F --> G[Begin SQL Transaction]
    G --> H[Insert into 'users' table]
    H --> I{Insert Success?}
    I -->|No| J[Rollback Transaction]
    I -->|Yes| K[Insert into 'user_profiles' table]
    K --> L{Insert Success?}
    L -->|No| J
    L -->|Yes| M[Commit Transaction]
    M --> N[Hash Password via Bcrypt]
    N --> O[Redirect to Login]

Data Storage (uploads/)

Files uploaded by users are stored in specific sub-directories:

1. assignments/: Teacher-uploaded handouts.
2. submissions/: Student-uploaded assignment turn-ins.
3. materials/: General course resources.
4. avatars/: User profile pictures.

7. Security & Coding Standards

1. Database Security

• PDO Prepared Statements: Never write raw SQL in UI files. Always use :placeholder in Classes to prevent SQL Injection.

  // Correct Usage in Class
  $query = "SELECT * FROM users WHERE email = :email";
  $stmt = $this->conn->prepare($query);
  $stmt->bindParam(':email', $email);

• Transactions: Use SQL transactions for multi-table operations (e.g., users and user_profiles) to prevent orphaned data.

2. Input/Output Security

• XSS Prevention: Always wrap echoed user data with htmlspecialchars().

  echo htmlspecialchars($user['username'], ENT_QUOTES, 'UTF-8');

• Password Encryption: Passwords are never stored as text.
  • Storage: password_hash($password, PASSWORD_DEFAULT)
  • Verification: password_verify($input, $hash)

3. Session & Access Control

• Header Initialization: Every page includes includes/header.php, which starts the session and checks permissions via the Role class.
• Redirect After Post: After an action script finishes, always use header("Location: ...") to prevent "form resubmission" errors on refresh.

8. Beginner's Tips & Best Practices

1. Start at header.php: To understand system startup, security, or session management, examine this file first.
2. Check Database.php: Ensure DB credentials are correct when setting up locally.
3. Follow the Sidebar: Look at includes/sidebar.php to understand how menu items link to different modules based on roles.
4. Use the Classes: Never write raw SQL in your UI files. Always add a method to the relevant class in includes/classes/.
5. Soft Deletes: We never actually delete user data. We set a timestamp (deleted_at = NOW()) to allow for data recovery.
6. Sorting: Managed via SQL ORDER BY and UI-side DataTables for real-time sorting.

---

Documentation Consolidated from Versions 1.0 - 5.0
EduManage Pro LMS Development Team

📘 EduManage Pro LMS - Technical Documentation

Version: 4.0 (Comprehensive Guide) | Stack: PHP 8.x, MySQL, Bootstrap

---

🔑 Key Files in includes/

• header.php: Initializes the session, database connection ($db), and handles authentication/permissions for every page.
• sidebar.php: Defines the navigation menu dynamically based on $_SESSION['user_role_id'].
• classes/: Contains PHP classes that handle business logic (e.g., User.php for login/registration, Course.php for course management).

📦 Module Breakdown (Granular Guide)

A. User Management (modules/user/)

🖥️ UI Files:

• login.php - User authentication interface
• register.php - Registration form with role selection
• users.php - Table view of all users with search/filter
• user_view.php - Read-only detailed profile view
• user_edit.php - Multi-tab form for updating profile, password, settings
• roles.php - List of system roles and their permissions
• manage_children.php - Interface for parents to link accounts to students

⚙️ Action Files (modules/user/actions/):

• user_register.php - Validates and persists new user accounts
• user_update.php - Processes profile changes and redirects
• user_delete.php - Removes a user account (Soft delete)
• role_action.php - Updates permissions assigned to a specific role
• import_action.php - Processes CSV uploads for bulk user registration
• manage_children_action.php - Links students to a guardian (Parent) account

B. Course & Content (modules/course/)

• courses.php - Grid/Table view of all courses
• form.php - Unified form for adding and editing courses
• materials.php - Interface for managing course handouts and links
• enrollment.php - Form to enroll students into a course
• Actions: add_course_action.php, upload_material_action.php, enroll_student_action.php

C. Assessment & Grading (modules/assessment/)

• assignments.php - Management dashboard for teacher-created assignments
• quizzes.php - Dashboard for managing online quizzes
• gradebook.php - Interactive table for entering grades
• Actions: create_quiz_action.php, save_grade_action.php

💡 Other modules like Classroom, Student, and Communication follow the same UI/Action pattern.

---

🏗️ Architecture & Coding Structure

The system follows a classic Model-View-Controller (MVC) Lite pattern:

A. The Data Layer (Model)

Located in includes/classes/. Each file represents a real-world entity.

• Example: Database.php handles the PDO connection to MySQL. User.php contains methods like login() and register().

B. The Logic Layer (Controller)

Located in modules/[module_name]/actions/. These files process form submissions (POST requests) and interact with the classes.

Flow: UI Form → Action Script → Class Method → Database

C. The Presentation Layer (View)

Located in the main folder and modules/. These are the PHP files the user sees in their browser.

• Example: index.php (Dashboard), modules/course/courses.php (Course List)

---

🔍 Deep Dive: User Module Engineering

A. How Data Saves to Database (Flow)

1. UI Layer (register.php): The user enters data (Full Name, Email, Password). The form uses POST to send data to the action script.
2. Action Layer (modules/user/actions/user_register.php):
   • Validation: Checks if required fields are empty.
   • Lookup: Calls $user->emailExists() and $user->usernameExists() to ensure uniqueness.
   • File Handling: If a profile photo is uploaded, it is moved to uploads/profile/ and a record is created in the files table.
3. Class Layer (includes/classes/User.php):
   • The action script calls $user->register($data).
   • Transaction: The class uses $this->conn->beginTransaction() to ensure that both the users and user_profiles tables are updated, or neither is (Atomicity).
4. Persistence (SQL): The class uses prepared statements to insert data safely.

B. Coding Style & Security

1. Encryption (Password Security)

We use the industry-standard PASSWORD_DEFAULT (Bcrypt) algorithm.

• Saving: When registering, we use password_hash($password, PASSWORD_DEFAULT).
• Verifying: During login, we fetch the hash from the DB and use password_verify($entered_password, $stored_hash).

// Sample from User.php
$password_hash = password_hash($data['password'], PASSWORD_DEFAULT);

// ... later in login() ...
if ($user && password_verify($password, $user['users_password_hash'])) {
   return $user; // Success
}

2. Database Operations (CRUD)

• INSERT: Performed in register() using a transaction.
• SELECT: Performed in getAllUsers(). Uses LEFT JOIN to combine users, user_profiles, and roles tables.
• UPDATE: Performed in updateUser(). Updates core account and profile details separately.
• DELETE: We use Soft Deletes. Instead of removing the row, we set users_deleted_at = NOW(). This allows for data recovery.
• SORT: Handled via SQL ORDER BY u.users_created_at DESC and UI-side using DataTables (jQuery) for real-time sorting.

3. Data Validation

Validation happens in the Action script before bothering the database:

if (empty($data['email']) || empty($data['password'])) {
   $response['message'] = 'Required fields are missing.';
   echo json_encode($response);
   exit;
}

C. Example: Database Interaction Component

The code uses PDO (PHP Data Objects) with named placeholders like :email to prevent SQL Injection attacks.

$query = "SELECT users_id FROM users WHERE users_email = :email";
$stmt = $this->conn->prepare($query);
$stmt->bindParam(':email', $email);
$stmt->execute();

---

🧩 Core Classes Overview

Class	Purpose
Database	Manages the PDO connection
User	Handles authentication, profile management, and permissions
Course	Manages course creation, updates, and materials
Analytics	Fetches dashboard statistics and logs recent activity
Enrollment	Tracks which students are in which courses
Role	Manages permissions and feature access for different user types

---

🔄 Modules & Data Flow

Each module follows a consistent structure. Let's look at the Course Module as an example:

Module Structure (modules/course/)

• courses.php - Displays a list of all courses
• form.php - UI for adding or editing a course
• enrollment.php - Manages student lists for a course
• actions/ - Contains scripts like course_save_action.php which handle the actual database saving

How Data Flows (Example: Saving a Course)

1. User Input: User fills out the form in modules/course/form.php.
2. Submission: The form submits data via POST to modules/course/actions/course_save_action.php.
3. Processing: The action script creates a new Course($db) object and calls $course->update() or $course->create().
4. Persistence: The class interacts with the MySQL database via PDO.
5. Feedback: The script redirects the user back to courses.php with a success message.

---

🎓 Beginner's Tips

• ✅ Start at header.php: If you want to understand how the system starts up or how security works, look here.
• ✅ Check Database.php: Make sure your DB credentials are correct if you're setting this up locally.
• ✅ Follow the Sidebar: Look at includes/sidebar.php to see how the menu items link to different modules.
• ✅ Use the Classes: Never write raw SQL in your UI files. Always add a method to the relevant class in includes/classes/.

---

Generated for EduManage Pro LMS Beginners Guide
Comprehensive Technical Documentation v4.0

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Blogger.com - Create a unique and beautiful blog easily, beginner-friendly article formatted in HTML. You can copy the code below, save it as an `.html` file (e.g., `blogger-guide.html`), or paste it into a code editor to view. It includes styling to make it look professional and readable.

The A to Z Guide to Google Blogger for Beginners

Welcome to the world of blogging! This guide is designed for students and beginners who want to learn everything about Google Blogger, from creating an account to earning money.

1. Getting Started: Account & Login

What is Google Blogger used for? It is a free platform provided by Google that allows you to publish your thoughts, stories, and articles on the internet. It is perfect for personal diaries, news sites, or educational blogs.

How to Sign Up and Login

1. Go to www.blogger.com.
2. Click on "Create your blog" or "Sign In".
3. Use your existing Gmail address (Google Account) to log in. If you don't have one, click "Create account".
4. Once logged in, you will see the Blogger Dashboard.

2. How to Create a Blog for Free

Is Google Blogger free to use? Yes, it is 100% free. Follow these steps to launch your site:

1. Click "New Blog": On the dashboard, click the arrow next to the red "New Blog" button.
2. Title: Enter a catchy name for your blog (e.g., "John's Tech Reviews").
3. Address (URL): This will be your website link (e.g., johnstech.blogspot.com). It must be unique.
4. Template: Choose a basic design (like Contempo or Soho) to start. You can change this later.
5. Click "Save": Your blog is now live!

3. Posts vs. Pages

Beginners often confuse these two. Here is the difference:

• Blogger Post: These are your daily articles, news, or stories. They appear in reverse chronological order (newest first). Examples: "My Trip to Paris," "How to Bake a Cake."
• Pages: These are static content that doesn't change often. Examples: "About Us," "Contact Me," "Privacy Policy."

How to Write a Blogger Post

1. Click "New Post" on the left menu.
2. Title: Write a clear title.
3. Body: Write your content. You can add images, videos, and format text (Bold, Italic) using the toolbar.
4. Labels: Add tags (categories) on the right side to organize your posts.
5. Publish: Click the orange "Publish" button to make it live.

4. Settings, Status, and SEO

Blog Status

In the Settings menu, you can control your blog's visibility:

• Visible to search engines: Keep this ON so people can find you on Google.
• Visible to readers: If you turn this OFF, your blog becomes private.

Basic SEO (Search Engine Optimization)

SEO helps your blog appear in Google Search results.

• Meta Description: In Settings > Search Preferences, enable "Meta tags" and write a short description of what your blog is about.
• Keywords: Use words in your title and post that people might search for.
• Permalinks: When writing a post, set a "Custom Permalink" on the right side to make your URL short and clean (e.g., .../best-pizza-recipe).

5. Can You Earn Money with Blogger?

Can Google Blogger earn money? Yes! However, it requires hard work and consistency.

How to Monetize

1. Google AdSense: This is the most popular way. Google shows ads on your blog, and you get paid when people view or click them. You usually need 20-30 high-quality posts before applying.
2. Affiliate Marketing: You recommend products (like Amazon) and get a commission if someone buys through your link.
3. Sponsored Posts: Companies pay you to write about their products.

Important Note on Earnings: Many students ask, "How do I make $100 per day with Google AdSense?" or "Which is the No. 1 money earning app?"

There is no "magic app" that pays you instantly. Making $100/day requires a blog with thousands of daily visitors. It takes time (6 months to 1 year) to build that traffic. Be patient and focus on writing good content first.

6. People Also Ask (FAQ)

Is Blogger 100% free?

Yes. Hosting, templates, and the subdomain (.blogspot.com) are completely free. You only pay if you choose to buy a custom domain name (like .com).

How to blog for free?

Simply sign up with a Gmail account at Blogger.com. You do not need to pay for hosting or software.

Who is the richest Blogger?

While rankings change, names like Arianna Huffington (HuffPost) and Michael Arrington (TechCrunch) are often cited as some of the highest-earning bloggers in history, making millions annually.

How much does Google pay for 1000 views on a blog?

This varies wildly based on your niche and location. On average, RPM (Revenue Per Mille) can range from $1 to $10 for every 1,000 views. Finance blogs pay more; entertainment blogs pay less.

What is the Blogger App?

The Blogger App (available on Android and iOS) allows you to write posts, upload photos, and check stats directly from your phone without needing a computer.

---

Start your journey today! Remember, the best time to plant a tree was 20 years ago. The second best time is now.

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• ✅ Live Online Classes (Individual or Group)
• ✅ Sample Projects & Assignments (PHP, MySQL, Java, Python, Web Dev)
• ✅ Past Exam Papers + Model Answers
• ✅ Easy-to-Follow Tutorials & Study Notes
• ✅ Final Year Project Guidance – From Idea to Implementation
• ✅ Doubt-Clearing Sessions & Exam Prep Strategies

🌍 Taught in Your Preferred Language

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📞 Get Started Today!

Call / WhatsApp: +94 72 962 2034

Email: itclasssl@gmail.com

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🔗 Free Resources & Community Links

• ▶️ YouTube Tutorials
• 📝 WordPress Blog
• ❓ Quora Q&A
• 💼 LinkedIn Profile
• 📬 Newsletter Signup
• 🌐 Wix Training Hub
• 🎓 Project Guidance Site
• 💡 Strikingly Project Ideas
• 💬 Elakiri Forum Thread

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© 2026 IT Classes SL | Empowering Sri Lankan IT Students, One Lesson at a Time 🇱🇰

eSkills – Grade 3 (Second Edition) book with full, simple notes lyceum international gateway college ICT Computer Science Notes study guide PDF | Chapter 1: My Devices

📘 Chapter 1: My Devices

1.1 Store

Storing means saving information to use later.

Devices used to store:

• 💻 Computer / Laptop

• 📱 Tablet

• 💾 USB flash drive

• 💿 External hard drive

What can we store?

• Photos

• Videos

• Homework

• Music

---

1.2 Print

Printing means putting computer work onto paper.

Device used: 🖨 Printer

What can be printed?

• Assignments

• Pictures

• Letters

• Certificates

---

1.3 Capture

Capture means recording or taking something.

Devices:

• 📷 Camera (photos)

• 📹 Video camera (videos)

• 🎤 Microphone (sound)

• 📱 Smartphone

---

1.4 Interact

Interact means communicating with the computer.

Input Devices (we give information)

• ⌨ Keyboard

• 🖱 Mouse

• 🎤 Microphone

• Touchscreen

Output Devices (computer gives results)

• 🖥 Monitor

• 🔊 Speakers

• 🖨 Printer

---

📘 Chapter 2: My Files

2.1 What is a File?

A file is saved information on a computer.

Examples:

• Document file (.docx)

• Picture file (.jpg)

• Music file (.mp3)

• Video file (.mp4)

Every file has:

• Name

• Type

---

2.2 Organize My Folders

A folder keeps files organized.

📁 Folder = School bag
📄 Files = Books inside

Why organize?

• Easy to find

• Save time

• Keep computer neat

---

2.3 Search and Find

Use the search bar to find files.

Steps:

1. Click search

2. Type name

3. Press Enter

4. Open file

---

2.4 Start a Program

A program/app helps us do tasks.

Examples:

• Word processor

• Paint

• Browser

Steps:

1. Click Start

2. Choose program

3. Click to open

---

📘 Chapter 3: My First Article

3.1 Work with Text

Text means typed words.

Use:

• Letters & numbers

• Spacebar

• Enter key

• Backspace

---

3.2 Give a Title

A title tells the topic.

Tips:

• Make it bigger

• Bold it

• Keep at top

---

3.3 Make a List

Lists organize ideas.

Types:

• Bullet list

• Number list

Example:

• Pencil

• Book

• Bag

---

3.4 Check and Save

✔ Check spelling
✔ Check punctuation

To save:

1. Click File

2. Click Save

3. Choose folder

4. Name file

5. Click Save

---

📘 Chapter 4: My Wired World

4.1 Search for Anything

The internet helps us find information.

Use a search engine to:

• Find pictures

• Get information

• Watch videos

Always type clear keywords.

---

4.2 Knowledge Treasure Sites

Educational websites help learning.

Examples:

• Online dictionaries

• Kids learning websites

• Educational videos

Use safe and trusted websites only.

---

4.3 Be Polite

Follow netiquette (internet manners).

✔ Be respectful
✔ Use kind words
✔ Do not type in ALL CAPS
✔ Do not bully others

---

4.4 Safety Online

Stay safe online:

🔒 Do not share:

• Passwords

• Home address

• Phone number

✔ Use strong passwords
✔ Tell parents/teachers if something is wrong

---

📘 Chapter 5: My First Presentation

5.1 All About Slides

A presentation is made using slides.

Each slide can have:

• Title

• Text

• Pictures

Keep slides simple and neat.

---

5.2 Insert Text

To add text:

1. Click text box

2. Type your words

3. Change size or color if needed

Keep text short and clear.

---

5.3 Insert Pictures

Steps:

1. Click Insert

2. Choose Picture

3. Select image

4. Click Insert

Pictures make slides interesting.

---

5.4 Presenting is Cool

Tips for presenting:

• Stand straight

• Speak clearly

• Look at audience

• Do not read everything

• Smile 😊

Practice before presenting!

---

✅ FINAL QUICK REVISION

Chapter	Main Topic
1	Devices (store, print, capture, interact)
2	Files and folders
3	Writing and saving articles
4	Internet and online safety
5	Creating presentations

---

---

📘 Chapter 1: My Devices

(Explained for Grade 3)

Computers and other digital devices help us do many things.
They can store, print, capture, and help us interact.

Let’s learn each one clearly 👇

---

1️⃣ Store (Saving Things)

What does “store” mean?

To store means to save something so we can use it later.

👉 Just like you keep your toys in a box.
👉 Or you keep your books in your school bag.

Computers also keep things safely.

Example:

• When you type your homework and click Save, the computer stores it.

• When you take a photo, it is stored in your phone.

Devices that store:

• 💻 Computer

• 📱 Tablet

• 💾 USB pen drive

Simple Example for Kids:

Ali writes a story in the computer.
He clicks Save.
Now the story is stored.
He can open it tomorrow again!

---

2️⃣ Print (Putting Work on Paper)

What does “print” mean?

To print means to take work from the computer and put it on paper.

👉 Like taking a picture from inside the computer and making it come out on paper.

Device used:

🖨 Printer

Example:

• You type homework → Print it → Give it to teacher.

• You draw a picture in Paint → Print it → Show your parents.

Simple Story:

Sara made a birthday card on the computer.
She printed it using a printer.
Now she can give it to her friend!

---

3️⃣ Capture (Taking Photos or Recording)

What does “capture” mean?

To capture means to take or record something.

👉 Like catching a happy moment!

Devices that capture:

• 📷 Camera (takes photos)

• 📹 Video camera (records videos)

• 🎤 Microphone (records voice)

• 📱 Smartphone

Examples:

• Taking a photo at a school trip

• Recording your singing

• Making a video for a project

Simple Example:

Amir sings a song.
His mother records it using a phone.
The phone captures his voice.

---

4️⃣ Interact (Talking to the Computer)

What does “interact” mean?

To interact means to talk or work with the computer.

👉 You give instructions.
👉 The computer gives you answers.

It is like a conversation!

---

Input Devices (We give information)

These help us tell the computer what to do.

• ⌨ Keyboard – to type

• 🖱 Mouse – to click

• 🎤 Microphone – to speak

• Touchscreen – to touch

Example:

You type your name using the keyboard.
That is input.

---

Output Devices (Computer gives answers)

These show us what the computer did.

• 🖥 Monitor – shows pictures and words

• 🔊 Speakers – play sound

• 🖨 Printer – prints on paper

Example:

You play a song.
The speakers make sound.
That is output.

---

🌟 Easy Way to Remember

Word	Meaning	Easy Example
Store	Save for later	Save homework
Print	Put on paper	Print project
Capture	Take photo/video	Take selfie
Interact	Work with computer	Type and see result

---

🎯 Small Practice Questions (For Kids)

1. What device do we use to print?

2. What does “store” mean?

3. Is a keyboard input or output?

4. What device takes photos?

---

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🚀 Master Your IT Degree with Expert Guidance!

Online Individual & Group Classes in English | Sinhala | Tamil

Struggling with assignments, projects, or exams? Get personalized support tailored for BIT (University of Moratuwa), UCSC, and other IT degree students in Sri Lanka.

✨ What You'll Get

• ✅ Live Online Classes (Individual or Group)
• ✅ Sample Projects & Assignments (PHP, MySQL, Java, Python, Web Dev)
• ✅ Past Exam Papers + Model Answers
• ✅ Easy-to-Follow Tutorials & Study Notes
• ✅ Final Year Project Guidance – From Idea to Implementation
• ✅ Doubt-Clearing Sessions & Exam Prep Strategies

🌍 Taught in Your Preferred Language

English | Sinhala | Tamil

📞 Get Started Today!

Call / WhatsApp: +94 72 962 2034

Email: itclasssl@gmail.com

Quick response guaranteed! Share your syllabus or project topic, and we'll craft a learning plan just for you.

🔗 Free Resources & Community Links

• ▶️ YouTube Tutorials
• 💼 LinkedIn Profile
• 📝 WordPress Blog
• ❓ Quora Q&A
• 📬 Newsletter Signup
• 🌐 Wix Training Hub
• 🎓 Project Guidance Site
• 💡 Strikingly Project Ideas
• 💬 Elakiri Forum Thread

Tags: #BIT #UCSC #UniversityOfMoratuwa #ITClassesSriLanka #PHPProject #MySQL #FinalYearProject #OnlineTuition #SinhalaMedium #TamilMedium #ProgrammingHelp #WebDevelopment

© 2026 IT Classes SL | Empowering Sri Lankan IT Students, One Lesson at a Time 🇱🇰