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.

Face cards each count as 10, Aces count as 1 or 11, all others count at face value. An Ace with any 10, Jack, Queen, or King is a Blackjack.  If you have a Blackjack, the dealer pays you one-and-a-half times your bet  unless the dealer also has a Blackjack, in which case it's a push  and neither wins.

Deal one up card to each player, followed by a down card to the dealer. Then deal a second up card to each player, followed by the dealer's up card. Make sure the cards are laid out diagonally so that both numbers on each card are visible. This makes it easy for both the player and the dealer to read the cards.