There is no guaranteed strategy for winning at roulette as it is a game of chance and the outcomes are determined by a random number generator. However, some players may use different betting systems such as the Martingale system or the Fibonacci system. These systems involve increasing or decreasing the amount of money bet based on whether the player wins or loses. But it's important to note that no betting system can change the odds of the game in your favor, it only changes the amount of money you win or lose.