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xkcd #1597: Git
(imgs.xkcd.com)
Title text: 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.
Transcript
[Cueball points to a computer on a desk while Ponytail and Hairy are standing further away behind an office chair.]
Cueball: This is git. It tracks collaborative work on projects through a beautiful distributed graph theory tree model.
Ponytail: Cool. How do we use it?
Cueball: No idea. Just memorize these shell commands and type them to sync up. If you get errors, save your work elsewhere, delete the project, and download a fresh copy.
Git is something that is very comfortable to use after a year or two, but when you initially start using it, it is just so easy to mess things up in ways that are unrecoverable. I remember the silly days when I'd back up all my changes first before using git since I would so regularly lose everything through a combination of git commands.
It's easy for me now, but the initial stages punish mistakes severely. It's the dark souls of source control, except it's not really fun. It's just a very beginner unfriendly tool.