In order to use RStudio efficiently, you might be wondering are there any useful shortcuts that I can use. In order to find them, you can click on the tools menu and then click on keyboard shortcuts. The shortcut to this is Alt + Shift + K. By clicking on this I bring up the quick reference guide, and that gives me a series of different shortcuts available on the screen. I can scroll through this list and find anything that I might find useful and utilise it. I can also click on see all shortcuts in the top right, where my mouse is and this will take me to a webpage, which is built inside of my own computer, a HTM file and on the left I see the window's shortcuts and on the right I see for a MAC. Predominately they are the same, but occasionally they are different. 

Going back into the RStudio environment, I'll show you some that I find useful for myself, that I use quite regularly. If I was to type out some code that I felt needed to be made into a comment, rather than actual code, I could use the shortcut Control + Shift + C and that would comment out my code and make it a user-friendly note. I can also run a selection. If I type in a series of commands in the screen here, two plus two and three plus three and I'd like to run that, I can select everything with the Shift key and then press the shortcut key, Control + Enter to run this in the console.