A comprehensive guide to online blackjack emphasizes the importance of mathematical strategies. It introduces the “basic strategy,” a mathematically optimal approach for each hand scenario, which minimizes the house edge. Key strategies include when to hit, stand, double down, split pairs, and surrender, along with the risks of insurance bets. The guide also discusses game variables like the number of decks and specific rules such as “blackjack pays 3:2” and “dealer stands on soft 17.”