Skill vs Chance
In most games skill plays no role.
In most forms of gambling, skill has no role in the outcome. When playing games such as the Lottery, Slot Machines, VLTs, Roulette, Craps, Keno, Mini Baccarat and Raffles, the results of these games are produced purely by chance and randomness.
Games that have some skill element.
Most of the games where skill might play a minor role are card or sports-based games. In games such as these, the player is required to make a decision during the course of play. Players that make statistically correct decisions may come out ahead more often than players who go on hunches.
In games such as these, even though the player can make a more "statistically correct" decision there is still a house advantage, meaning the gaming operator will always keep more money than they pay out in wins over the long term. The only control you have over these games in terms of limiting your losses is by decreasing the amount you bet, reducing your speed of play and cutting down the length of time you play; so, play these games for their entertainment value and not to make money.