Continue reading to learn all about the best ways to play 21 in land-based casinos and at online gaming sites. We will provide you with playing tips in this basic guide to blackjack. If you play with basic strategy, you can reduce the casino advantage to around 0.5%, making blackjack a game with one of the lowest house edges on the casino floor. The right blackjack strategy will lower the house edge and, if you master card counting, might even allow you to win at the table.