myrm, welcome
Something I've found very helpful over the years is to keep a book of "things to know". The one I have is intended for an address book and has lined pages with a cut out alphabet down the side. So every time (well, most anyway) I see a new one, I write it in.
Easy examples are the word "Judge" in a clue can mean the letters "ref" (referee). So I put entries under J and R. "Sailor" can mean the letters AB or TAR. (question to those who know (!) - also RN?)
The other day I found that "gym" or PE can mean "Y" in American crosswords, derived from YMCA. References to guns can mean the letters "BB" because that's what airguns there are called. Who knew?
There are loads of these, I could never remember them all
Ros