For the novice, there are machine games, commonly referred to as "one armed bandits" where you insert coins and try to use the lever to stop the number.
If the three numbers are in-sync, you end up winning. These casinos and their games are always built with house advantage.
You almost always play against the house, and hence, the house wins.
Remember that casinos need to make enough money to keep the lavish show running!
There are many "gambling fallacies" that can influence your decisions, so always keep a cool head, and think about probablity logically.
It is best to have a budget when you walk into the casino, savour all the glamour and great food. Play a bit and get out.