How does RNG work?

Hey guys, I am not exactly a newbie, but I recently started wondering how [RNG ]( this game works. I am not sure how crit. strike, spawning dragons, even damage dealing works. I suppose there is math behind everything, but it seems to me that sometimes it is all up to coincidence and it drives me crazy :D Do you have any kind of link/video where the mechanics behind this are explained? I would like to understand it, not to be so bad :D
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