Codecademy just launched a new course that will teach you how to use the version control application Git. In the free two-hour course, you'll learn how to create and manage a project with Git.
The four units cover basic Git workflow, how to backtrack (or undo changes), Git branching (managing multiple versions of a project), and teamwork (Git collaborations).
We've talked a bit about Git before in our guide to using GitHub, but nothing is as effective for learning as hands-on practice, which Codecademy provides.
Learn Git [Codecademy]