This is a sample website made as part of the Learn Enough Git™ to Be Dangerous, a great resource for learning Git. Check it out and follow @learnenough on Twitter.
After finishing Learn Enough Git™ to Be Dangerous, you'll know enough Git to be dangerous. This means you'll be able to use Git to track changes in your projects, back up data, share your work with others, and collaborate with programmers and other users of Git.
Official Git Documentation can be found here.