When play slots there is no strategy to make you win. What you can do is follow some rules to give yourself a better opportunity to win.
When you are about to play a machine you should read all the information included on the slot machine. If you don't understand the rules you may end up missing a big win.
When playing slots you need to take it slow. The faster you play the quicker you could lose money. The speed at which you play will not improve you chance to win.
Before you start playing slot machines, set a loss limit for each gaming session and no matter what do not go over it. If you are having bad luck come back. If you continue to play you may get mad and make irrational bets causing you to lose even more money.
When you play a progressive slot machine you should always play the maximum number of coins. The appeal of progressive machines is the huge jackpots. The only way to have a chance at these jackpot is to play all lines.
When you hit a large jackpot you should stop - it the most wise slots strategy. You should then set aside that money and play with the bankroll you started. If you want to take the chance and risk the money you won you should take the profits and play machines with a higher denomination to try to get even bigger wins.