I have forgotten so much grammar over the years, but who and whom have never been a problem. The problem that I have been having lately is trying to remember when the quotation marks go inside the period and when they go outside. I seem to remember that there were occasions, like the name of an article or story that was not a complete phrase, when the quotation marks went inside. Anyway, I just avoid using quotation marks as much as possible.
Quotation marks:
Keep the period, comma, semicolon inside of the quotes.
Put the question mark inside ONLY IF THAT WHICH IS IN THE QUOTES IS the question.
Do you want to vote, "No"?
We heard him when he asked, "Where is that damned Billyblythe Clinton?"
I made a "blooper": He made a simple "bloop."
Clinton told his "tall tale;" however, his "Little 'Lady' " wrote it.