for example you want to play blackjack, then play blackjack without betting first, play until you get the right feeling to start betting.
Practice makes perfect but this would be have no edge in gambling, it is ok to know how the game works because gambling is pure base on the luck of every person who played a game in gambling. The luck will turn to you at the right time that is why having huge capital is much better.
But if we have high-skills in gambling, it doesn't mean we can win every round because it still depends on how good our luck in that game. But I don't know with the other games with a base on the luck, and perhaps, we can get winning in that game although we didn't have good luck when we played. The best practice for me is making limitations on every game so I can know how much my budget to spend on gambling games and I won't spend more than my balance.