Blackjack is a simple game, but there are a lot of details among the rules. Select online play if you want to learn how to play blackjack at an online casino. Rules for the casino game 21 or blackjack, with links to pages on blackjack strategy, software and places to play online. Introduction · Equipment · Home Game Blackjack · The Dealer's Turn. Different casinos have different casino rules and variations in Blackjack. Knowing the variations are important because they affect chances of winning.