Add a comprehensive Git cheatsheet

Provides a detailed reference for Git commands including repository setup, basic operations, branching, stashing, history review, merging, rebasing, and configuration. Useful for quick lookup and as a learning resource for users.

cheat-sheets/git.md

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+# Git Cheatsheet
+## Repository Setup & Remote Operations
+```bash
+# Clone a repository
+git clone <repository-url>
+
+# Add a remote
+git remote add <name> <url>
+git remote add origin git@github.com:user/repo.git
+
+# Change remote URL
+git remote set-url origin <new-url>
+
+# View remotes
+git remote -v
+```
+
+## Basic Commands
+```bash
+# Check status
+git status
+
+# Stage files
+git add <file>          # Stage specific file
+git add .               # Stage all changes
+git add -p             # Interactively stage changes
+
+# Commit
+git commit -m "message"
+git commit --amend      # Modify last commit
+
+# Push/Pull
+git push origin <branch>
+git pull origin <branch>
+git pull --rebase origin <branch>  # Pull with rebase
+```
+
+## Branch Operations
+```bash
+# List branches
+git branch              # Local branches
+git branch -r           # Remote branches
+git branch -a           # All branches
+
+# Create branch
+git branch <branch-name>
+git checkout -b <branch-name>  # Create and switch
+
+# Checkout remote branch (create if not exists)
+git checkout -b <local-branch> origin/<remote-branch>
+git checkout --track origin/<remote-branch>  # Shorter version
+
+# Switch branch
+git checkout <branch-name>
+
+# Delete branch
+git branch -d <branch-name>    # Local branch
+git push origin --delete <branch-name>  # Remote branch
+```
+
+## Working with Changes
+```bash
+# View changes
+git diff               # Unstaged changes
+git diff --staged      # Staged changes
+git diff <branch1> <branch2>  # Between branches
+
+# Discard changes
+git checkout -- <file>  # Discard file changes
+git restore <file>      # Modern version
+git reset --hard HEAD   # Discard all changes
+
+# Stash changes
+git stash
+git stash save "message"
+git stash list
+git stash pop          # Apply and remove
+git stash apply        # Apply and keep
+```
+
+## History and Logs
+```bash
+# View history
+git log
+git log --oneline      # Compact view
+git log --graph        # With branch graph
+git blame <file>       # File history
+
+# Search history
+git log --grep="keyword"  # Search commits
+git log -S"code"         # Search code changes
+```
+
+## Merge and Rebase
+```bash
+# Merge
+git merge <branch>
+git merge --abort      # Cancel merge
+
+# Rebase
+git rebase <branch>
+git rebase -i HEAD~3   # Interactive rebase last 3 commits
+git rebase --abort     # Cancel rebase
+```
+
+## Credential Caching
+```bash
+# Cache credentials temporarily
+git config --global credential.helper cache                    # Default 15 min
+git config --global credential.helper 'cache --timeout=3600'   # Custom timeout (seconds)
+
+# Store credentials indefinitely
+git config --global credential.helper store                    # Stored in plaintext
+git config --global credential.helper 'manager-core'           # Windows credential manager
+git config --global credential.helper osxkeychain             # macOS keychain
+
+# For GitHub specifically - Using Personal Access Token
+git config --global credential.helper store                    # Then use token as password
+```
+
+## Configuration
+```bash
+# User setup
+git config --global user.name "Your Name"
+git config --global user.email "your.email@example.com"
+
+# Aliases
+git config --global alias.co checkout
+git config --global alias.br branch
+git config --global alias.st status
+git config --global alias.unstage 'reset HEAD --'
+
+# View config
+git config --list
+```
+
+## Advanced/Useful Commands
+```bash
+# Cherry-pick commits
+git cherry-pick <commit-hash>
+
+# Clean untracked files
+git clean -n            # Dry run
+git clean -fd           # Force delete
+
+# Find lost commits
+git reflog
+
+# Save work in progress
+git commit -m "WIP"     # Quick save
+git reset HEAD~         # Undo WIP commit
+
+# Update fork with upstream
+git remote add upstream <original-repo-url>
+git fetch upstream
+git rebase upstream/main
+```