Some of the most commonly misused English words.
I can never get “affect” and “effect” right, and my beta readers will tell you I also constantly mess up “bought” and “brought” even though they’re not even slightly the same word. (In my defence, I pronounce them almost identically in speech.)
I will also confess I’m one of those people who doesn’t care much about the difference between “less” and “fewer”, given how interchangeable they are in modern spoken English. And, yes. I also use “literally” figuratively. Fight me.