I usually skim the Gang of Four design patterns because that's something people love to ask about despite it not necessarily being something folks need to memorize for work.

I think the most important thing is to think of or look up interpersonal questions like "tell us about a time you got negative feedback" and have moments ready to talk about. If someone is asking me about HTTP verbs I know a lot off the top of my head but things like that I usually have to actively think about to remember.