Git & GitHub for Beginners: Complete Step-by-Step Tutorial (2026)

Git is the most essential tool every developer must learn. Whether you're building websites, mobile apps, or AI models — version control with Git is a non-negotiable skill. This beginner-friendly guide walks you through everything from your first commit to collaborating on GitHub like a pro.

🔧 What is Git?

Git is a free, open-source distributed version control system that tracks changes in your code. It lets you:

• Save snapshots of your project at any point
• Revert to previous versions if something breaks
• Collaborate with other developers without overwriting each other's work
• Work on multiple features simultaneously using branches

📥 Installing Git

# Check if Git is installed
git --version

# Install on macOS (using Homebrew)
brew install git

# Install on Ubuntu/Debian
sudo apt-get install git

# Install on Windows — download from git-scm.com
# Or use: winget install --id Git.Git

⚙️ First-Time Setup

# Configure your identity (required before first commit)
git config --global user.name "Your Name"
git config --global user.email "you@example.com"

# Set default branch name to 'main'
git config --global init.defaultBranch main

# Verify your settings
git config --list

🚀 Your First Repository

# Create a new project folder
mkdir my-first-project
cd my-first-project

# Initialize a Git repository
git init

# Create a file
echo "# My First Project" > README.md

# Stage the file (add to tracking)
git add README.md

# Commit (save a snapshot)
git commit -m "Initial commit: add README"

# Check the log
git log --oneline

🌿 Branching — Work on Features Safely

Branches let you work on new features without affecting the main codebase.

# Create and switch to a new branch
git checkout -b feature/login-page

# Make changes, then stage and commit
git add .
git commit -m "Add login page UI"

# Switch back to main
git checkout main

# Merge the feature branch into main
git merge feature/login-page

# Delete the branch after merging
git branch -d feature/login-page

☁️ Pushing to GitHub

# Create a repo on github.com first, then:
git remote add origin https://github.com/username/my-project.git

# Push your code
git push -u origin main

# For subsequent pushes
git push

🤝 Collaboration Workflow (Pull Requests)

Step	Command / Action
1. Fork the repo	Click "Fork" on GitHub
2. Clone your fork	git clone URL
3. Create a branch	git checkout -b fix/bug-123
4. Make changes & commit	git add . && git commit -m "Fix bug"
5. Push to your fork	git push origin fix/bug-123
6. Open Pull Request	Click "New Pull Request" on GitHub

⚔️ Resolving Merge Conflicts

# When Git can't auto-merge, you'll see conflict markers:
<<<<<<< HEAD
  console.log("Hello from main");
=======
  console.log("Hello from feature branch");
>>>>>>> feature/new-greeting

# Fix by choosing the correct code, then:
git add .
git commit -m "Resolve merge conflict"

📋 Essential Git Commands Cheat Sheet

Command	What It Does
git status	See changed/staged files
git diff	See exact changes in files
git stash	Temporarily save uncommitted changes
git log --oneline --graph	Visual branch history
git reset --hard HEAD~1	Undo last commit (destructive)
git revert HEAD	Undo last commit (safe)