Research the Git SCM website. Identify the resources that are available on the site. Including: About, Downloads, Documentation, Book
Git - About
The 'About' section on the Git SCM website includes a variety of information about the features of Git SCM and how it came to be.
Git - Downloads
The 'Download' section shows GUI tools you can download on Mac, Windows, or Linux. Prices and license are also shown to help you decide what tools you want.
Git - Documentation
The 'Documentation' section has tools that you can use to learn about Git. The tools provided are a reference manual, a book about Git, and videos to teach you what Git is.
Git - Book
The Pro Git book is written by Scott Chacon and Ben Straub and is available online for free.
Summary of the Documentation
The Git SCM website has tons of available resources that can help you understand what Git is all about and how to use it.