These are my slides from a 90-minute lesson introducing Git and GitHub to Data Science students at General Assembly's DC campus.
My YouTube video series with similar content: https://www.youtube.com/playlist?list=PL5-da3qGB5IBLMp7LtN8Nc3Efd4hJq0kD
My Git quick reference guide: http://www.dataschool.io/git-quick-reference-for-beginners/
Understanding the Git and GitHub workflow: http://www.dataschool.io/simple-guide-to-forks-in-github-and-git/
Blog post about the presentation: http://www.dataschool.io/github-is-just-dropbox-for-git/