I am starting to learn German and I'm trying out Duolingo, I've faced this problem several times. If I understand correctly "sie" means both she and they. So if there is no context, can I distinguish ...
"Bescheid wissen" means "to know something very well": Du weißt Bescheid, was ich meine. Something like "don't pretend that you don't know that". When someone says that doesn't know something ...