How to Play Blackjack. Blackjack is a simple card game that has more players than roulette, craps, and baccarat combined. Blackjack is mainly a luck and. Blackjack may be played with one to eight decks of card decks. a "Simple Strategy," which is seven simple rules to playing blackjack. Select online play if you want to learn how to play blackjack at an online casino deck of cards and two people playing what is the most black jack show up.