Gambling is not a good for investment because there is a big risk that you will just lose on it. But if you are eager to do gambling the best practice would be you must know when to stop, win or lose. Just what they advise to gamblers/investors "just invest/play what you can afford to lose". If you already won stop don't be greedy it will just end up bust, if you lose stop also don't ever chase the amount you already lose because you will just end up losing more.
You should not even be expecting it all, and should only see it as just one little good part of the game and the fun, but better to see what you enjoy on the game and concentrate more on that than the winning as that makes more sense.
Maybe a best practice with gambling should be, having a resolution for not spending anything from your hand. Make use of promotions and giveaways to find entertainment or your future if you have skills. For unskilled gamblers, the best practice will be staying away or immigrate to gambling banned countries.