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Those are nice tips but how about don't even try it because they could get addicted or it could ruined their life.
But if they really want to try it and they could control their self then the only tip that I could give is try to enjoy it and don't be greedy.
Gambling won't ruin your life unless you don't know your own limitation and you allow greediness to take control of your decision making. The impact of gambling on your life depends on how you make your choices and actions. The problem is some gamblers do not think the possible outcomes before risking their funds that's why they lose and then end up doing the same mistake by playing the same game with the thought that they can get back the money they have lost but since they allow it to be a foundation of their decision, they end up losing again.