Windows

Download the official installer and accept defaults.

Download Git for Windows

macOS

Copybrew install git

If you don’t have Homebrew, get it at brew.sh.

Start a new local project

Copymkdir my-project && cd my-project
echo "# My Project" > README.md

Copygit init
git add . Or git add file-name (option)
git commit -m "Initial commit"
git branch -M main
git remote add origin https://github.com/user/repo.git
git push -u origin main

Clone an existing project

Copygit clone https://github.com/user/repo(file-name).git
cd repo (file name)
git init
git config --global user.name "Your Name"
git config --global user.email "you@example.com"
- if error
git remote add origin https://github.com/user/repo(file-name).git
git branch -M main
git push -u origin main

Copy
  git status
  git branch
  git checkout (to switch branch to other branch)
  git checkout -b branch name (to create new branch)
  git branch -d branch name (to delete branch)
  git remote -v
  git add remote origin your repo link(https://github.com/Gongchampou/GIT-help.git)
  git branch -M main
  git push -u origin main
  git diff (to check the branch changes)
  git merge branch name eg (main)
  git push origin branch name to push and ask for pull and Request
  git pull origin main(to get the fresh changes)
  git fetch origin
  rm file name (delete any file)
  remove-item -recurse -force .git (to delete git file inside the folder so that it wont connect and give problem when thing change)

Resume after connecting repo and local storage

Copygit add . or git add file-name (option)
git commit -m 'update massage'
git push origin main
git pull origin main --rebase
git push origin main

Cloning downloads a full copy of the project history.

See what changed

Copygit status
git diff           # unstaged changes
git diff --staged  # staged changes

Stage and commit

Copygit add file1 file2   # or: git add .
git commit -m "Describe the change"
# Quick add & commit for tracked files
git commit -am "Message"

View history

Copygit log --oneline
# Pretty graph view
git log --oneline --graph --decorate --all

.gitignore

Copynode_modules/
.env
.DS_Store
*.log
build/
dist/

Common fixes

Copy# Discard local (unstaged) changes
git restore path/to/file
# Unstage a file
git restore --staged path/to/file
# Edit the last commit
git commit --amend

Go back safely

Copy# Create a new commit that undoes a commit
git revert <commit_sha>

Move HEAD back (be careful)

Copy# Relative to HEAD
git reset --soft HEAD~1    # keep changes staged
git reset --mixed HEAD~1   # keep changes unstaged
git reset --hard HEAD~1    # discard changes

# Reset to a specific commit by ID (SHA)
git reset --soft <commit_sha>
git reset --mixed <commit_sha>
git reset --hard <commit_sha>

Create a new SSH key

Copyssh-keygen -t ed25519 -C "you@example.com"
# Press Enter to accept defaults, then set a passphrase

Start the agent and add your key

Copy# Windows PowerShell
Start-Service ssh-agent
ssh-add $env:USERPROFILE\.ssh\id_ed25519

# macOS/Linux
eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_ed25519

Add the public key to GitHub

Copy your public key and paste it into GitHub → Settings → SSH and GPG keys → New SSH key.

Copy# Windows
Get-Content $env:USERPROFILE\.ssh\id_ed25519.pub
# macOS/Linux
cat ~/.ssh/id_ed25519.pub

Common issues

• Permission denied (publickey): Add SSH key to GitHub and agent.
• Detached HEAD: Switch to a branch or create one from current commit.
• Rejected push: Pull or rebase first, or force-with-lease if you rewrote history.

Helpful inspection

Copygit remote -v
git log --oneline --graph --decorate --all
git status
git reflog