In other words, you don’t know what you don’t know. Yup, we all start there. Only reason I knew of those two functions is I happened to see them up in the context menu when working on BPs.
Unreal does make it somewhat easier to ‘explore’ the API structure, but in the beginning it does take some effort to look for things, start catching the keywords. For example, now that you know ‘actor’, you can type that into the context-menu and see you can get the actor’s world location, it’s vectors, other information. KNOWING is just exploring and that comes down to time.
My best suggestion is to look for tutorials on/around the things you want to do and just start absorbing knowledge. There IS a reason to the rhyme.