Having a new student join me to work in the lab reminded me that I should collect some of the many resources around for getting started in bioinformatics and any data-based science in general. So towards this end, one of the first essential tools for any data scientist is a knowledge of git.
Start first with Code School's simple introduction to git which gives you the basics of using git from the command line.
Then, check out set of lectures on Git and GitHub which goes into setting up git and using it with github. This is a set of lectures which was used in a Data Science course.