Git Reference Site

The Introduction from the Git Reference site:

This is the Git reference site. This is meant to be a quick reference for learning and remembering the most important and commonly used Git commands. The commands are organized into sections of the type of operation you may be trying to do, and will present the common options and commands needed to accomplish these common tasks.

Each section will link to the next section, so it can be used as a tutorial. Every page will also link to more in-depth Git documentation such as the offical manual pages and relevant sections in the Pro Git book, so you can learn more about any of the commands. First, we'll start with thinking about source code management like Git does.

Source: gitref.