There are a lot of gambling sites that rely on the skills and techniques for you to win the game, but actually that is what you should prefer to play compared to those gambling sites that only rely to the luck of the gamblers. Aside of playing you are also thinking or analyzing which is really important to maintain and boost the way we think.
Here is the link where you can learn some games that may require skills and techniques to win, and they also listed some ways for you to win:
https://www.gamblingsites.com/blog/100-ways-to-win-at-gambling-16240/In my own personal opinion, most gambling games depends on luck because without any luck it is impossible for you to have a good outcome of your cards or your bets. The only game that i know that requires skills and techniques is poker that even you have a bad card on your hand you can still bluff your opponents for them to fold their cards and for you to win.
Poker is really one of the best table card gambling games that always uses skills and technique that even you don't have any good cards on your deck, you can still win by just bluffing or pretending that you have a high card on your deck that could make them fold and win in the game.