Git for the lazy – Spheriki

Git is a distributed version control system. No, you don’t need to know what that means to use this guide. Think of it as a time machine: Subversion or CVS without the cruft.
If you make a lot of changes, but decided you made a mistake, this will save your butt.
This guide is for people who want to jump to any point in time with their project/game/whatever, and want something to use for themselves.
(Link: Git for the lazy – Spheriki)