(I thought about titling this tip “noncontiguous selection” but you probably wouldn’t have read this far!)
People who write code do this all the time in applications like VSCode and Brackets, but I didn’t realize that you can also do this in Word and Google Docs.
Let’s say you are writing an essay that mentions Harry Potter a bunch, and you decide you want to change all instances of “Potter” to “Terwilliger” so that Harry can preserve some dignified anonymity. But your essay also mentions your favorite potter, so you don’t want to risk doing a “search and replace.”
In Word or Google Docs select the first word you want to edit. Then hold the Control key down (Command on Macintosh) and select the second word you want to edit. Do this as many times as you want. You’ll have all the “Potters” selected, and you only have to type “Terwilliger” one time.