You cannot reliably win at roulette in the long run
Use a strict bankroll limit before you start
Set a win target and stop when you reach it
Set a loss limit and stop when you reach it
Prefer outside bets for lower volatility
Avoid betting systems that claim to beat the house edge
Do not chase losses
Do not increase bets to recover previous losses
Choose games with the best rules and lowest house edge
Avoid side bets and special bets with worse odds
Play only with money you can afford to lose
Stop playing when you are tired, emotional, or distracted
Treat roulette as entertainment, not income
Know the odds of every bet before placing it
If you want the best chance to leave ahead, quit while winning