Sorry if this has been posted and I couldn't see it, but what is good theory for winning with a knight and rook if your opponent has two rooks (and a king each obviously). Or is there some good reading about this anywhere? Good youtube?

That isn't winning. It is most likely a draw if neither side has pawns.

So is there no theory on how to try to edge an advantage. Clearly the person with 2 rooks has the natural advantage. But is there some standard rules or plays that one can follow that allows for a good fork to even the odds?