Beating the casino is every gambler's dream. It is a lot easier said than done, however. The old maxim that the house always wins is unfortunately true. Casinos are a business just like any other and they exist to make money. It is not in their interest to be beaten, so they do everything they can to ensure that the house wins.
Over time and averaged across all games, the house does always win. It is the nature of gambling that the odds are in favor of the house, not the player. However, this does not mean that an individual, playing at a particular game cannot beat the house. It simply means that as a whole, games disadvantage players.
Any particular individual, playing at a single game, has the ability to beat the house. Statistically, based on pure and random chance, anyone can beat the house in the short term. This is what most people call "luck". It is not really luck, but rather the statistically probable result of any finite series of plays. Beating the house in the long run is much more difficult because games are designed to favor the casino the longer they are played.
Beating the Casino in the Long Run
Though it may be difficult to beat the casino in the long run, it is not impossible. Professional gamblers have made careers of studying games like roulette and poker in order to discover how to shift the odds in their favor. Many of the systems that have been developed are completely worthless, others do have merit. The difficulty is deciphering the good systems from the bad. The best way to do this is to research any system thoroughly that claims to beat the casino in the long run and ask yourself if it sounds logical, practical, and legal.