In blackjack, common mistakes often stem from not following basic strategy, which leads to suboptimal decisions. Many players ignore the dealer’s upcard, overvalue soft hands, or incorrectly split and double down. Chasing losses by increasing bets after a loss is another error that can spiral into bigger losses. Some players also make the mistake of taking insurance bets, which are generally unfavorable, and others let emotions influence their gameplay, clouding their judgment. Poor bankroll management and not understanding house rules at different tables also contribute to mistakes. Finally, overcomplicating the game or using flawed betting systems can hinder success. To improve, players should stick to basic strategy, manage their emotions and bankroll, and avoid these common pitfalls.