Why study there. Appetite, as they say, comes with eating. When you start, then you will grasp the topic quickly. I myself played slot machines when I was young and we learned somehow intuitively. No one writes any books on such topics. Although I do not know of course, but it is unlikely. So, the most you might need rules is if you decide to play blackjack. I now make my living by playing on the site blackjackdoc.com/. This is more interesting than spinning a roulette wheel. At least so it seems to me.