Sometimes Copy and Paste is just tedious. Sometimes you have so much to duplicate that you’d use up all your undo’s before you finished your intended effect. Two quick key commands, which you may or may not have known about, make some duplicating tasks more productive and less time consuming.
Option + R will repeat your selection a specified number of times.
Option + Command + V will fill your selection with whatever is on the clipboard.
These key commands speed up the process of stutter edits, duplicating your chorus in a song, repeating a kick drum sample, etc. Check out the video below to see them used in context.