Have you heard aboutGitHub Learning Lab? It’s a new tool to help you learn GitHub...using GitHub! Go through guided courses on various topics and improve your skills at your own pace.
Check out one of these courses today:Introduction to GitHub. If you are looking for a quick and fun introduction to GitHub, you’ve found it. This class will get you started using GitHub in less than an hour. You'll perform some actions to help you become familiar with GitHub... using GitHub!