Git

If that doesn't fix it, git.txt contains the phone number of a friend of mine who understands git. Just wait through a few minutes of 'It's really pretty simple, just think of branches as...' and eventually you'll learn the commands that will fix everything.

Permanent link to this comic: https://xkcd.com/1597/
Image URL (for hotlinking/embedding): https://imgs.xkcd.com/comics/git.png