Every time you use actual money to bet on the games, you will also receive real winnings. Moreover, you can even win money by playing online slots with bonuses and extra spins awarded by the casino.
The truth is that there is no trick to slot machines. They provide random results based on set mechanics and it all comes down to luck. With that being said, not all games are the same, so picking the right options is key, and you can still change the size of the bet throughout the session for better results.