Every player must stick to his bankroll. Bankroll is the total amount of money you can afford to play with or to lose. With Bet Max button the player can play with the maximum number of coins available on this slot machine. Comp is so called additional bonus, which is given to the player who has been playing one and the same slot machine for quite a long period of time. Comp can be represented by free meals and in come casinos by money rewards. The percentage amount of the house edge indicates how much the casino wins from every bet over a long period of time. Payback is the reverse of the House edge for slot machines. The payback is how much a slot machine gives back for every dollar it takes in. If a machine has an 85 percent payback, it pays out 85 cents for every dollar it takes in; therefore, the House edge on the machine is 15 percent. Ideally, a slot machine you play will have no worse than a 90 percent payback, especially if you play slots online.

You must know exactly the game you are playing.
You should know exactly how many coins you are supposed to insert into a machine. Before leaving a machine cash out your credits.
Slots shouldn't be a stress for you, just enjoy. If you feel lucky increase your bets and vice-versa.