There we are at the most important point. Roulette is a game of chance, and no real so-called strategies or experience or skill work for a player in the game of roulette. The chances that a player may hit the jackpot or lose the game are the same probabilistically. Hence, the thumb rule is to play calculatedly and never ever spend more than 10-15 minutes at the roulette machine on a trot if you have not hit any fortune.
As mentioned already, since roulette presents equal chances for winning and losing, players are advice to bet wisely, and not to commit too much money at any point of time. Ideally, one should only bet which gives him equal chances for winning/losing, such as black or red, even or odd. In other words, the odds for these bets are 1:1. On the other hand, if you are hell bent on taking risks, then it would be a good idea to opt for split bets instead of straight up bets. With split bets, the chances of winning is 17:1 and it lets the player wager for two numbers as opposed to one number in the case of straight up bets. The chances of winning are 35:1 with straight up bets, which is a bit too risky.
It is also important to see which version of roulette you are playing. There are two versions of roulettes available in online casinos: European version and American version. The former has 37 numbers while the American roulette wheel contains 38. Since the odds of winning varies with the roulette wheel, bet depending on the version you play.
Then there is this myth doing rounds amongst players, even amongst experienced ones, which goes like this: more you play without winning, closer you are in your chances to win eventually. In fact, such beliefs actually force many players to continue playing roulette even beyond the 'ideal time limit' of 10-15 minutes, and eventually lose money. In reality, every new spin of the roulette wheel is a new spin, and it has no connection whatsoever with the earlier spins or outcomes. In other words, the outcome of a roulette spin or the probability advantage, it cannot be programmed or predicted in advance. If you are lucky, you'll win. Else, you'll lose money. As simple as that!
Finally while playing roulette online, make sure that you are interacting with a genuine online casino website and not any fraudulent ones. Roulette itself is a game of chance. It would be prudent if you don't take the chance of not verifying the authenticity of the online casino you are playing with. Always gamble with genuine online casinos.