If your hand is closer to 21 than the dealer's hand, you win. If your hand is ❤️ less than the dealer's hand, the house wins. If you tie the dealer's hand or the dealer draws 22, you ❤️ push (nobody wins or loses).
If a player has blackjack (and the ❤️ dealer DOES NOT,) pay the player 3/2 their bet. If they betR$5, you pay themR$7.50, for example. If the dealer ❤️ also has blackjack, it's a "push" and nobody wins.