This is a good place to start to wrap your head around simple version control techniques with git: http://rogerdudler.github.io/git-guide/
(The cheat sheet provided is also worth the download)

This tutorial is is pretty extensive and includes integration with RStudio: http://happygitwithr.com/index.html (recommended by Alex and John)

One of the more comprehensive guides I found: https://swcarpentry.github.io/git-novice/
It starts from the command line and then links you to a GitHub account to make collaborative changes. We can then try making changes on each other's repo on GitHub for the next meeting.
Key features:

starts you from scratch
contains efficient workflows for each section
has short exercises at the end of each lesson to test understanding
easy to read language

JH: Here is a git tutorial I made. Maybe this will be helpful to those getting started using git from either Rstudio or via the command line.

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