Makeout help!

So I’m in college and I have my first boyfriend and we’ve been dating for a while. Since he is my first boyfriend I know absolutely nothing when it comes to sexual things... (he was even my first kiss) and he’s experienced so he knows what he’s doing. Sometimes I feel stupid if I try to do something cuz idk if it’s hurting him. He’s fingered me before, and he’s been under my shirt a few times during steamy makeouts. But like I have no clue what to do back, and I want to do something back. Sometimes he puts my hand on his crotch while we’re making out and I just rub it but idk how hard cuz I don’t want to hurt him! I don’t think I’m ready to do bjs yet... but any advice on things I could to that could please him??