Balls??

Hi, so there are a LOT of posts about how to give a blow job, which I’m always curious about and almost everyone says don’t forget the balls and suck on them and I’m just super confused like do you put it all in you mouth?? Do you suck on them like a hickey?? What else do you do with them?? Also how does one ask is it okay to suck your balls too because that just feels very vulgar and I’m shy and overall very confused lol. I know these are probably silly questions.