When playing blackjack, it's important to avoid common mistakes that can reduce your chances of winning. Straying from basic strategy is a significant error, as it disregards optimal decision-making. Increasing bets after losses in an attempt to recover can lead to bigger losses, while poor bankroll management can deplete funds quickly. Be wary of side bets, which often have a higher house edge, and avoid letting emotions drive your decisions, as this can lead to impulsive play. By staying disciplined and sticking to a solid strategy, players can improve their overall blackjack experience.