Last year we pointed you in the direction of a cheat sheet for Git, the robust, yet somewhat intimidating version control system that has many uses outside of software projects. If you’re still not comfortable giving it a try, there are a number of online resources that allow you to get your hands dirty without even touching a real command line.
Jacob Gube at Six Revisions suggests a few sites you can try, though of those he recommends, I'd stick with this one from Code School that goes over the basics and once you've completed that, heading over to this one that explains how branching works.
You won't be a pro after knocking these over, but it will let you decide whether Git is for you. There are also plenty of graphical front-ends for it so you can avoid firing up a terminal entirely if you use something like SourceTree or TortoiseGit, or simply go with something completely online, like GitHub.
Interactive Git Tutorials [Six Revisions]