What advice would you give to a first-time 21 blackjack player?

So a buddy of mine is finally making his first trip to a real casino and wants to try 21 blackjack. He’s played online a bit, but never sat at a real table before. I told him it’s a totally different vibe—live dealer, table etiquette, and all that.

For those of you who’ve been around the tables for a while, what’s the best advice you’d give a first-timer? Basic strategy tips? Etiquette things to avoid? Anything you wish someone had told you before your first game?

Would love to pass some good tips his way!