Bonus is a special feature of the particular game theme, which is activated when certain symbols appear in a winning combination. In the bonus, the player is presented with several items on a screen from which to choose. After choosing items a number of credits is revealed and awarded. Some bonuses use a mechanical device, such as a spinning wheel. It is used in conjunction with the bonus for displaying the amount won.
Candle is a light on top of the slot machine. It flashes to alert the operator that change is needed, hand pay is requested or a potential problem with the machine.
Carousel refers to a grouping of slot machines, usually in a circle or oval formation.
There is a container where the coins that are immediately available for payouts are held called Coin hopper. When a player collects credits this mechanical device rotates coins into the coin tray. A coin diverter is used to redirect excess coins into a drop bucket, or drop box when a certain preset coin capacity is reached.
A visual display of the amount of money or credits on the machine is called Credit meter.
Drop bucket or Drop box is a container located in a slot machine's base where excess coins are diverted from the hopper. It is generally used in low denomination slot machines. As for high denomination slot machines they use a drop box. The difference between a drop box and a drop bucket is a hinged lid with one or more locks. The contents of drop buckets and drop boxes are collected and counted by the casino on a scheduled basis.
EGM is used as a short-hand for Electronic Gaming Machine.
The term Hand pay means a payout made by a slot attendant or cage, rather than the slot machine. A hand pay occurs when the amount of the payout exceeds the maximum amount that was preset by the slot machine's operator. At the level where the operator must begin to deduct taxes the maximum amount is set. A hand pay could also be necessary as a result of a short pay.
There is Hopper fill used to record the replenishments of the coin in the coin hopper after it becomes depleted as a result of making payouts to players. The slip indicates the amount of coins placed into the hoppers, the signatures of the employees involved in the transaction, the slot machine number and the location and the date.
Playing Low Level or Slant Top slot machines you can sit as they have a stool. Stand Up or Upright slot machines are played while standing.
The term Optimal play means a payback percentage based on a gambler using the optimal strategy in a skill-based slot machine game.
The term Payline means a straight or zigzagged line that crosses through one symbol on each reel, along which a winning combination is evaluated. Up to nine pay lines are contained by classic spinning reel machines and video slot machines contain up to a hundred ones.
The term Rollup is used to mean the process of dramatizing a win by playing sounds while the meters count up to the amount that has been won.
Short pay refers to a partial payout made by a slot machine, which is less than the amount due to the player. It can happen if the coin hopper has been depleted as a result of making earlier payouts to players. In this case the remaining amount will be paid as a hand pay or an attendant will come and re-fill the machine.
A document provided by the manufacturer for all slot machines is called Theoretical Hold Worksheet. It indicates the theoretical percentage that the slot machine should hold based on adequate levels of coin-in. The reel strip settings, number of coins that may be played, the payout schedule, the number of reels and other information is indicated in the worksheet.
The dollar amount of coins or tokens removed from a slot machine's drop bucket or drop box and counted by the casino's hard count team through the use of a weigh scale is called Weight count.

You must know exactly the game you are playing.
It is important to know the correct amount of coins that should be inserted into a machine. Cash your credits and only the leave the machine.
While playing just have a good time. Use money management. Increase your bets when you are winning, and decrease your bets when you are losing.