OP, One of the best systems developed precisely for European roulette in the online casino is the so-called "Red" system.

This strategy uses the fact that in the third column on the roulette table there are 8 numbered red sectors and only 4 black sectors.

Following this tactic it is necessary to make only two bets: for example, 5 euros to the third column and 10 euros for the insurance - to the black.

The possible variants of the result of the round in the roulette are following:

If the red one falls and also one of the sectors placed in the third column, you will win 10 euros when betting on the third column and you will lose 10 euros when you bet on the black one. That is, the expenses will be equal to zero.
If one of the black sectors falls in the third column, you will receive 10 euros when betting on the column and also 10 - when betting on black. The total benefit will be equal to 20 euros.
If the red sector placed in the first or second column falls you will lose both bets and lose 15 euros.
If the black sector of the first or second column falls, you will lose 5 euros as the bet to the column, but you will win 10 - like the black bet. The benefit will be equal to 5 euros.
And finally, in the less likely case, when sector 0 falls, you will lose both bets and 15 euros.
I have encounter a dozen of games such as Common Draw Roulette, Euro Roulette, European Roulette BSG, French Roulette, Zoom Roulette, Live Roulette Table 1, All American and American Roulette at my favorite online casino VegasCasino.io. Plus playing them using practice mode.