Never split 10's or 5's. Always split 8's or 7's against a dealer's card of equal or lower value. Always split aces. Never split face cards, 10's, or 5's . Slots - Recognize the symbols that constitute a jackpot on your machine.
All machines are different.
Try to always play the maximum bet. If a machine will take a bet of two dollars, place the two-dollar bet. This gives you the best odds of winning long-term if you get a good hand. If you get a good hit play another couple of pulls and run with your money. But some people will swear by it.