Indeed, poker is a classic, especially Texas Hold’em. But there are other cool options. For example, Blackjack is popular due to its simplicity and low casino advantage. You should also try Baccarat - it is especially popular among players from Asia, the game is simple and elegant. For something unusual, I recommend Pai Gow Poker, there is less risk and a lot of draws, which helps save money. If you are interested in seeing the rating of the most popular games with descriptions, I recommend you take a look here:
https://www.thebulletintime.com/trend/ranking-the-most-popular-card-games/ — everything is laid out on the shelves there: what is popular and why, who it is suitable for, and what a beginner should pay attention to.