This document provides an introduction and overview of Git, including: 1. An overview of centralized (CVCS) and distributed (DVCS) version control systems and how Git is a DVCS that uses snapshots, not differences. 2. Instructions on installing Git and setting user configuration. 3. Descriptions of basic Git commands like init, add, commit, tag, log, clone, branch, checkout. 4. An explanation of how to set up a Git repository in Dropbox for cloud backup and collaboration.