Long-term, you should understand more about what you are doing. Rote clicking in RStudio may be a short-term survival method but won’t work for long.
The book Pro Git is fantastic and comprehensive.
Find a powerful Git client (chapter 9) if you’d like to minimize your usage of Git from the command line.
Hadley Wickham’s book R Packages has an excellent chapter on the use of Git, GitHub, and RStudio in R package development. He covers more advanced usage, such as commit best practices, issues, branching, and pull requests.
Ten Simple Rules for Taking Advantage of Git and GitHub http://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1004947
RStudio’s guide Version Control with Git and SVN