# Git (/academy/git)



Git is a numbered sketchbook. You never scribble over last night's page. You turn to a new one.

The book lives on your laptop. Every [commit](/academy/commit) is a full page: every file, as it was, plus a caption. A [branch](/academy/branch) is a second book clipped to the first — same opening pages, different mess. [GitHub](/academy/github) is the studio shelf. You park the book there so another laptop, a teammate, or an agent can open the same pages.

You do not need to "know Git." You need three habits.

**Save the page before you wreck it**

Hackathon pace plus an agent — [MCP](/academy/mcp), the plugin, whatever is driving the [CLI](/academy/cli) — will break things. That's the job. Take a page when login works. Take another before you "just rewrite auth." If the rewrite is a crime scene, you flip back. The working page is still there.

`npx create-hackhaton-space-stack@latest` hands you a repo. The first useful move is not another pass through the [builder](/builder). It is a commit while the generated app still boots.

**Don't rip pages other people already copied**

History you already pushed is a shared wall. Rewriting it is tearing sheets out of someone else's book. [Merge](/academy/merge) forward. Don't pretend Friday never happened.

Git tracks lines, not vibes. It knows what you added, what you deleted, and when. "It ran before lunch" becomes a flip through pages, not a guess.

The book also travels. Clone it on a second machine and the whole numbered stack comes with you. That is why the scaffold is a repo, not a zip you email yourself.

**What this unlocks**

Fearless edits. The sketchbook is why you can let an agent try the dumb idea.

Keep turning pages. The book outlives the bad hour.