If you were 100% guaranteed to win when you played, it wouldn’t be gambling. While there is no way to guarantee you’ll win, certain table games allow a player’s skill to improve their chances of winning. In games like Blackjack and poker, a player’s skill will have a much bigger impact on the results than something like slots. Not all table games provide this opportunity though, as games like Roulette and Craps are still heavily dependent on luck.