Roulette seems like a pretty simple game. You pick the numbers; you place your bets. However, for a professional, things are not so obvious, as there are many strategies and tactics to maximize the chance of winning.
How to play roulette from a professional's point of view
For a pro, the most important thing is to keep an eye on your bankroll. Of course, no one can predict the behavior of the ball falling into the hole. Therefore, any "100% winning" tactics are always nothing but a cheat. Observation of your account is the first rule of a professional.
Next, you need to decide on the amount you plan to win. If you have already earned it, then do not continue, you will only increase the risk of losing.
Do not take excessive risks. And if the game is clearly not going very well, then give up the games for today. Come back in a few days.

Since you're probably playing virtual roulette, choose a time when you won't be distracted. Do not bet at work - they may misunderstand. Equally dangerous is a group of friends who will "encourage" and demand that you bet more and more, wagering, etc.
Try to choose games with a live croupier. There are also fully virtual analogs, but with them,there is a higher risk that they are "tweaked". Yes, in practice this almost never happens, but live online broadcasts with real people are still much more reliable.
Another tip from the pros: choose European roulette. It has one zero sector, while the American one has two. So, , twice the chance that all profits will automatically go to the casino. In virtual games there is roulette without "zero" at all, try to find one.
Do not forget about the reviews. Dishonest casinos or specific croupiers quickly collect negative information. Do not ignore it.
Here is another fundamental advice that will help you play professionally: yes, you can and should use strategies. But don't be in a hurry to play for money right away. Any roulette allows you to make as many free spins as you want before you put your chips in. So first see how the strategy works, and then try it with real money.
Experiment. Any strategy is just one way to win.
It is not one hundred percent; it does not give any guarantee. So, you can change it, do it differently, and transform it to suit yourself. Perhaps you will be able to find the optimal approach, which will allow you to win much more often.