How the big boys code

Don't just code into the R console, which is the default window that opens when you first open R. Instead, start a new R editor by

File -> New script

Here you can write out your code as well as notes.

To make notes, put # in front of it:

this is code

#this is note

To run a line of code, you can either copy and paste from the console or highlight it and hit control and R.