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🌱 Introduction to Git & GitHub (Beginner Guide)

This chapter introduces the basics of Git, GitHub, and GitHub Desktop. You’ll learn how version control works and how to manage your code like a professional developer.

📌 What is Git?

Git is a version control system.
It helps you track changes in your code over time.

Why use Git?

  • Save your work history
  • Go back to older versions
  • Work in teams without overwriting each other’s code

Basic Git Commands

git init        # Start a new Git repository
git status      # Check file changes
git add .       # Stage all files
git commit -m "message"   # Save changes

🌐 What is GitHub?

GitHub is an online platform where you store your Git repositories.

What GitHub is used for:

  • Store your projects online
  • Share code with others
  • Collaborate in teams
  • Showcase your portfolio

🖥️ What is GitHub Desktop?

GitHub Desktop is a graphical app that lets you use Git without typing commands.

With GitHub Desktop you can: - Commit changes - Push to GitHub - Pull updates - Create branches - Resolve conflicts visually

🔄 Core Git Concepts

✅ Commit

A commit saves your changes with a message.

Think of it as taking a snapshot of your code.

In GitHub Desktop: 1. Select files 2. Write a message 3. Click Commit to main

⬆️ Push

Push sends your local commits to GitHub (online).

In GitHub Desktop:
Click Push origin

⬇️ Pull

Pull brings the latest changes from GitHub to your computer.

In GitHub Desktop:
Click Fetch origin → Pull

🔍 Fetch

Fetch checks if new updates exist (without downloading them yet).

In GitHub Desktop:
Click Fetch origin

🌿 Branching (Working on New Features Safely)

A branch is a separate version of your project.

Use branches to: - Add features - Fix bugs - Experiment safely

Common Branch Names

  • main → main project
  • feature-login
  • bug-fix-header

In GitHub Desktop:

  1. Click Current Branch
  2. Click New Branch
  3. Name your branch
  4. Click Create Branch

🔀 Merging Branches

When your feature is ready, you merge it into main.

In GitHub Desktop: 1. Switch to main 2. Click Branch → Merge into Current Branch 3. Select your feature branch

🧭 Typical Workflow (Using GitHub Desktop)

1. Create / Open Repository
2. Make changes
3. Commit
4. Push to GitHub
5. Pull updates from others
6. Create branches for new features

🧠 Summary

Tool / Term Purpose
Git Tracks code history
GitHub Stores code online
GitHub Desktop Easy Git interface
Commit Save changes
Push Upload to GitHub
Pull Download updates
Fetch Check for updates
Branch Separate feature version

🚀 Practice Task

  1. Create a GitHub account
  2. Install GitHub Desktop
  3. Create a new repository
  4. Add a file: index.html
  5. Commit & Push
  6. Create a new branch and modify the file