Set Up Git and Initialize Repository

# Set your Git username and email

git config --global user.name "Your Name" git config --global user.email "your_email@example.com" # Initialize a Git repository (if not already done) git init # Add all files to the staging area git add . # Commit the initial files git commit -m "Initial commit" # Add your GitHub repository as a remote git remote add origin https://github.com/<your-username>/<your-repo-name>.git # Push your code to the main branch git push -u origin main

Create and Work on a New Branch

# Create and switch to a new branch git checkout -b <branch-name> # Add all files and commit changes git add . git commit -m "Your commit message" # Push the branch to the remote repository git push -u origin <branch-name>

Merge Branch into Main

# Switch to the main branch git checkout main # Merge the feature branch into main git merge <branch-name> -m "Merge <branch-name> into main" # Push the merged changes to the remote repository git push origin main

Pull Latest Changes from Main

# Pull the latest changes from the remote repository git pull origin main

Clean Up

# Delete a branch locally after merging git branch -d <branch-name> # Delete a branch remotely git push origin --delete <branch-name>

Rollback to Last Commit

# Discard changes to a specific file git checkout -- <filename> # Discard all uncommitted changes git reset --hard # If needed, reset to a specific commit git reset --hard <commit-hash>

Add .gitignore for Ignoring Files

# Create a .gitignore file touch .gitignore # Example entries for a .gitignore file echo "node_modules/" >> .gitignore echo ".env" >> .gitignore echo "dist/" >> .gitignore # Add and commit the .gitignore file git add .gitignore git commit -m "Add .gitignore"

One-Liner Setup for a New Repository

For a fresh project setup, this single block of commands can be used:

git init && git config --global user.name "Your Name" && git config --global user.email "your_email@example.c

Cleaning up and verifying your Git configuration nano ~/.gitconfig Your file should ideally look like this: [user] name = Your Name email = your_email@example.com Delete all other entries. Save and Exit Press Ctrl+O to save changes. Press Enter to confirm the file name. Press Ctrl+X to exit Nano.

Create Files ex: touch index.html

Roll back one file to the last committed state: git checkout index.html

Roll back all files: git checkout -f

Hard reset to the last commit: git reset –hard

Create a .gitignore file to specify files and folders to be ignored by Git: touch .gitignore

Switch to an existing branch: git checkout branch_name

Merge Branches git merge branch_name -m “Merge message”