Objective: Get cards totaling closer to 21 than the dealer without going over.
Card Values: Number cards = face value, Face cards = 10, Ace = 1 or 11.
Blackjack: Ace + 10-value card in first 2 cards. Pays 3:2.
Hit: Take another card. You can hit until you bust (go over 21).
Stand: Keep your current hand and end your turn.
Double Down: Double your bet and take exactly one more card.
Split: If you have a pair, split into two hands (doubles your bet).
Insurance: Side bet when dealer shows Ace. Pays 2:1 if dealer has blackjack.