Installing R & RStudio
R is a command line based language, and those who are comfortable with the UNIX environment are welcome to download R by itself and immediately begin working. It is worth noting, however, that the majority of online projects and tutorials with which you follow along will assume you are using RStudio. The IDE provides a host of tools that make it a valuable resource, especially for visualizations and web integration.
Feel free to play around! The RStudio IDE Cheatsheet is an excellent resource for getting the most out of your workstation. For more of these helpful resources, in RStudio go to Help -> Cheatsheets.