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Other people have produced tutorials on Version Control, Basics of using Git, and workflow using Git. I'm not aware of a tutorial of social scientists. If you find one, please let me know.
Differences between GitHub.com and The University of Texas’s repository (github.austin.utexas.edu)
GitHub.com is a location where you may store your open repository for free and you can explore the open repositories of other individuals and research teams that archive their materials there. For example, I just found a repository for DHS indicators, which provides stata "code for all DHS Program indicators listed in the Guide to DHS Statistics" by searching for "demography." It is possible to pay to create a private repository should you not want to make your code openly available immediately. Note that even open repositories are only readable to the world. One can't alter an open repository without becoming a collaborator, but one can "fork" a repository to create a copy for oneself that remembers its origins.
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