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.
Online casinos fulfill this requirement for online slots by using a random number generator (RNG). The random number generator is an algorithm generated by a computer that online casinos use to randomize the results of a spin.