Explain simply how a casino works?

How are the slot machines/roulette/poker played? How are casino chips used? How does the casino get money from this? I've tried to search it on google but it's a bit confusing. Can anyone explain it simply? Thanks. (PS. It's for something I'm writing, I'm not actually going to a casino, and... show more How are the slot machines/roulette/poker played? How are casino chips used? How does the casino get money from this? I've tried to search it on google but it's a bit confusing. Can anyone explain it simply? Thanks. (PS. It's for something I'm writing, I'm not actually going to a casino, and there aren't any anywhere near where I live, so I can't really go find out).
Update: Help me plz I am dumb I need aSSISTANCE
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