Of course when it comes to betting at an online casino you can never be 100% sure that you will win. It is a gamble and you should never really gamble/bet more than you can afford to lose.
When it comes to playing card games online this is no different to when you play in real life. You should decide on your strategy and stick to it as much as possible. Betting randomly is not the best way to be successful. There is no way to give a proven formula or strategy to win however sticking to a game plan will help!
If you do have a bad luck streak then don’t panic. You also shouldn’t chase your losing. Often you will just end up losing even more. If you are losing sometimes it is best to walk away and come back in a few hours or the next day. This method works the same if you are winning. Don’t assume because you have won a large amount of money that this will continue. Be thankful for what you have won & walk away.
Always go into a casino with a limit on how much you are willing to lose. This way you will have a limit and know when to stop. Part of the success of winning is knowing how to walk away when you are losing.
As long as you follow these sensible steps then you have every chance of turning playing on at online casino into an enjoyable hobby that can make you an extra few pounds or dollars each month.