There are none, it is simply entertainment. If you approach it with this attitude, you may get lucky sometimes, if you go in hoping to come out wealthy, you will lose.
Let's not aim for money, instead look for the entertainment value, this is not our game and casinos has more interest of making themselves more profitable and they control the odds so we will never be given any advantage to beat them. Of course we win sometimes but let us not think we are already good as sometimes that will lead us to be aggressive and will lose more money. If we want to make money then I guess stay away from gambling and maybe focus on trading and investing as it gives good chances.
That is true, the reason why a lot of people get addicted is because they believe truly that they will profit from gambling and they will win back what they lost. However, it would be too late for them to realize that gambling is not a profit activity for the gamblers but more for the casinos and gambling site operators. Since indeed that is their business.