Hi!

In this hand:
BB coldcall vs raise & 3bet

Dawnfall26 suggested to cap certain hands instead of cold-calling. He's very experienced & smart player so I trust his feeling for the game. But I'm not so experienced and this feeling hasn't developed yet for me...

Can you please provide some mathematical guidelines to learn the direction to dig for? Maybe cold-calling is better? If 3bet with certain hands, why?