git
Domain: Version Control
🎯 Motivation
git is a distributed version control system that tracks every change to your code. For young developers, it acts like a time machine that lets you undo mistakes and collaborate with others on the same project without overwriting each other’s work.
📋 Concrete Example
You start a project with git init, save changes with git commit -m "add login page", and see history with git log. Every commit is a snapshot you can return to anytime.
🔗 Analogy
Think of git as a notebook where every page is numbered and dated. You can tear out any page, photocopy an old one, or let a friend add their own pages without ruining yours.