Cardgames are interesting because they seldom need more than the cards themself to be played. Some are easy, and some are hard. But they are almost always fun. I will not talk about poker but hopefully you will find it interesting nonetheless.
Card games are good to have when you want to bring a game but don’t have much room to bring it. Some cardgames are just for two people, while others are for more. Some where you want to kill your enemy, some where you play by yourself for points and even some where you want to lose spectacularly because that is how you win! Sometimes rules are set in stone and sometimes the rules change the instant a card is played.