Gamblimg and Safe are two different Words.
Gambling cannot be safe for sure.
+1. Gambling and safe are two words that contradicts each other. Gambling simply means to take 'risks' and taking risks means becoming unsafe. I doubt there's any Safe method in gambling because you're throwing out your money from your pocket to the table and hope that your money will come back to you together with some profit. Otherwise, the house will get your money.
There might be some ways that are considered as 'safe' by some people. Like betting really really small amount of money instead of betting high amounts. IMO this is actually a dumb way of gambling. If you can't take the risk, then just go home. Just like they say, Go big or go home.
Anyways, even if you bet really small amount, the chance of you winning/losing is still the same when you bet a bigger amount. Either way, if you don't stop gambling, you'll eventually lose all your money. Remember, the house doesn't beat you. It only gives you the chance to beat yourself.