As a professional gambler myself, the first thing I was taught was to learn the rules of the game you are playing, and the rules of the establishment you are playing in. For instance, the rules of blackjack in a casino are different from the rules of blackjack that you play with a friend or a group of friends. Also, the video poker machines give the player the greatest edge against the casino. Slot machines give the greatest edge to the casino. Here is another lesson I have learned from my time as a gambler:
(1) Casinos are there to make money, period. They make their money by using some psychology against the players. Most players will go to a casino, and after a moment or two, will begin to win some money. In the player's mind, he is thinking, "Yes, I won! Now it's time to keep playing so I can win some more, because I'm on a roll!" Well, now the player may win some more, and this just increases his enthusiasm to keep playing because he is on a roll. And then, the player starts to lose money. And then he loses some more. Now he's thinking, "I've lost half of my money! Okay, I'm going to keep playing until I make my money back, and then I'm outta here!" Suddenly, the money the player won, is now gone! Now the player, who is frustrated and emotional, says, "Okay, I'm going to gamble some more money, because I'm not gonna just leave here empty handed!" Shortly after this, the player has lost the money he won, and also the money he brought to the casino to gamble with. He may even have cashed his paycheck at the casino in order to try to win back the money he lost! Professional gamblers understand this scenario, so our rule is, "Big or small, whatever you win initially, take it and leave." When the casino lets you win some money initially, it's time to cash out and leave immediately. Short term, the player has a small edge; long term, the casino has a HUGE edge. The casino will always win long term, so in order to win consistently, you must take anything you win and go home. There's always another casino, and there's always tomorrow!