Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
"Learn Git Branching" is the most visual and interactive way to learn Git on the web; you'll be challenged with exciting levels, given step-by-step demonstrations of powerful features, and maybe even have a bit of fun along the way.
After this dialog you'll see the variety of levels we have to offer. If you're a beginner, just go ahead and start with the first. If you already know some Git basics, try some of our later more challenging levels.