The don'ts are mainly related to making sure you do not end up losing more than you can afford when playing. If you have lost your daily budget it is important to call it quits for the day. Chasing your losses is a bad idea as it can lead to even more losses. You should also avoid drinking too many alcoholic beverages as this can lead to making strategy mistakes and bad decisions.
In the right circumstances, however, the player sometimes will break up a flush, a straight, or a pair of jacks or better. If you do not have one of the "always keep" hands, use the following list. Possible predraw hands are listed in order. Find the highest listing that fits your predraw hand, and discard any cards that do not fit the hand. For example, if your hand includes jack of spades, jack of diamonds, 10 of diamonds, 9 of diamonds, and 8 of diamonds, you have four cards to an open straight flush in diamonds, and you also have a pair of jacks or better. The four-card open straight flush is higher on the list than the pair of jacks or better, so you would discard the jack of spades and draw to the four-card straight flush. You are giving up the certain 1-for-1 payoff for a pair of jacks, but you have a chance at a straight flush with either a queen or 7 of diamonds, could draw a flush with any other diamond, or still could finish with a pair of jacks by drawing the jack of either clubs or hearts.
Winning a slot machine jackpot is based solely on luck. You put your money in the machine, hit the spin button and hope that Lady Luck will invite you to dance. There are no decisions to make that will change the outcome of the spin. On the other hand, many table games require skill and the decisions you make can determine whether you win or lose. Most table games when played properly have a lower house edge than the slot machines. Knowledgeable Blackjack players know that learning basic strategy will reduce the house edge to less than one percent.