When an experienced dealer spins the Roulette wheel and releases the ball with approximately the same speed it is called the dealer signature. As long as there is little or no deflection from the metal stops on the roulette wheel it is possible to predict where the ball will drop. If a number repeats often within 100 spins you may have found a biased wheel that can turn the house advantage around to your favor. The biased wheel gives you an opportunity to overcome the house’s advantage. Before playing the game you have to buy in special colored chips, and after the game exchange them for regular casino chips. Never make 5 number bets as they have the least profitable payback. The house advantage on a 5 number bet is a whopping 7.89 percent. Never play American Roulette as 00 decreases your chances of winning. European Roulette is more in your favor. When playing European Roulette don’t forget about the Surrender option. Never spend more than you have planned to.
One of the strategy for roulette is boldness. This is a strategy where your goal is to double your money. In a negative expectation game, your best chance of doubling your money is to bet it all once on red or black, or even or odd, and cross your fingers. You'll have a 47% or so chance of doubling your money.]
Remember that there is no any roulette strategy. So don't pay money for it. Set a goal before you start gambling. Stop gambling if your goal is reached.

The numbers 1 through 36 are divided evenly among red and black "pockets" on the Roulette wheel. The pocket is the container that a ball may come to rest in. The Roulette wheel also has on or two green pockets. The green pockets has numbers 0 and 00 or only 00, depending on the kind of Roulette.
A roulette dealer (usually referred to as "croupier" spins the wheel counter clockwise and releases what is usually a plastic ball along the track that runs along the top of the wheel's cavity. The wheel loses speed and as a result the ball comes down from the track, bounces a little and then lands in one of the pockets.