You just have to stick to legal, regulated online casino sites such as BetMGM, Caesars Palace Online Casino, FanDuel, Betway, bet365 and BetRivers. They offer great casino game ranges and they will pay out quickly and without any issues if you win.
Since they're licensed and prominently display a seal from state gambling regulators to prove it, BetMGM, Caesars Palace, DraftKings, Golden Nugget and Borgata are among the most trusted online casinos.