I mean, it's not bad if it's just a game, right? Hell, I'd never gamble real money but if I have money to spare in a game I might just do it.
On the topic of how to play the games... You have to be more specific in which games you are playing, because there are a LOT of games played in casinos.
"NintenDON'T sue me please haha"
Don't learn how to gamble. You'll slide into debt. That's no good.