I get kind of confused with how i should be playing on fishy tables and obviously these are places where you can maximise profit. I understand playing hands with position on these players is always a good thing but i'm unsure when it comes to calling ranges and 3bet ranges, i'm aware that postflop it's usually pointless to bluff or sometimes even cbet flops against such wide ranges i.e. 60-70/10 types that call whether they have air or a monster but how wide should we be cold calling OOP and what apart from the top of our range (if anything) should we be 3betting?

e.g.

You have 2 passive fish on your left, say 70/10 types, fold to flop cbet like 10%. How light should you be opening knowing they'll flat almost every time but rarely 3bet but will almost always call a cbet regardless of board texture.