You can beat the table with this roulette system and it's not even a secret. You have to choose one of these red/black or odd/even and to start betting. first bet 1$ to red for example and if you lose you have to bet again on red but this time double your first bet. If you lose again you have to continue betting and double your last bet everytime until you win and after that you can chance the color and start again from 1$. Easy money but you have to choose casino wisely because some of them have maximum bet size and then you can't double your bet and you lose.
Here's the math of this system. First bet is 1$ and second 2$ etc.4$+8$+16$+32$ and you win in 32$bet your bet wins double so you get 64$ and if we count your bets so far we can see 63$ so you did profit of 1$ to get some real wins in this system you have to play a lot but it's worth of it. I think you already noticed that you won exatly your first bet so if you start with 5$ bet you win 5$ but you have to be carefull because of the max bet size.