This is a sample website made as part of Learn Enough™ to Be Dangerous, possibly the greatest beginner Git tutorial in the history of the universe. You should totally check it out, and be sure to join the the email list 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 projects, back up data, share your work with others, and collaborate with programmers and others, and collaborate with programmers and others users to Git.
For more information on Git, see the official Git documentation