Also helpful for people viewing this workshop...   
Install git and understand version control: https://swcarpentry.github.io/git-novice/
Git basics on YouTube: https://www.youtube.com/playlist?list=PL90vX4e9ORqeE1wyMbST9pJ1-Mj45f2JY

Do next after this workshop...
Git for RStudio users: https://www.youtube.com/playlist?list=PL90vX4e9ORqeE1wyMbST9pJ1-Mj45f2JY
Git lessons, self-guided: https://github.com/carpentries-incubator/github-without-command-line
Advanced git: https://github.com/carpentries-incubator/advanced-git
GitLab for code collaboration: https://carpentries-incubator.github.io/gitlab-novice/

Supporting information
More about this workshop series: https://researchci.it.wisc.edu/git-and-gitlab-workshops/
DoIT Shared Tools GitLab service overview: https://kb.wisc.edu/shared-tools/132910