Being a winning slot machine player is not possible. The machines in every slot are created to give the house an advantage over the long run, so the house will always come out in the lead if you are playing for long enough. The only way to counteract the edge of the house in slot machine games is to choose an online game that has a big jackpot, bet the maximum amount each time you play and bet that you hit the jackpot. When you win the jackpot that is really huge, guess what you do next? Quit playing the game.
Don't get me wrong. I'm not saying that it's not a good idea to play slots. In fact, I believe slot games, especially the ones that are truly good can be a lot of entertainment. But you want to keep in your mind that mathematically, what you're doing playing a game on a regular basis, is paying to enjoy. It is possible to calculate the amount you're paying for that entertainment simply by multiplying your stake times your average bet times the number of spins per hour.
For instance, if you're playing a slot with a pay-out of 95%, then your house advantage is five percent. (The casino keeps the 5% from every bet that you place over the long-term.) If your bet is $3, then you're going to pay an average of 15 cents each time you spin the casino. (5% times $3.) Assuming you're making 500 spins in an hour, the game will cost an hour of play for $75 that may or may not be a reasonable price for you entertainment. That depends on your bankroll.
Another thing to consider in the calculation is what the bonuses and perks you receive by the gambling establishment are worth. If you're at an online casino and you're receiving drinks for free while playing, then you could subtract the cost of the drinks from your hourly rate. (Or you could add the cost of these drinks to the value of entertainment that you're getting--it's only an issue of perspective.) My recommendation is to drink top-shelf liquor and top-quality beers to maximize the entertainment value you're getting. For instance, a Heineken costs $4 for a bottle in a nice restaurant. Drink two Heinekens an hour, and you've reduced the cost nyaste casinon to play each hour from $75 to $68.
Slot clubs also refund the amount you lost every hour, so be sure you join the slot club of your casino and always use your credit card to track your play. There's no reason why you shouldn't to do this. They also give their biggest slot players with comps like show tickets, meals and rooms for free, that all lessen the amount you're spending each hour that you're on their machines.
So how to be a successful slot machine player? I'd sum it up by saying that you should know how much it costs you to play each time and every hour make the most of the bonuses and comps, and go for the huge progressive jackpot.