This is just the basics, but anyone should be aware of it:
Budget: set it BEFORE you start gambling and stick to it.
Have a break from time to time, it is important to let your brain stop and consider.
Avoid drugs / drink as much as possible, they will make you loose some control innevitably.
Seek help if you feel you are no longer in control. Make a phone call to a friend or go out and speak with someone.
Anything else anyone can think of? Like... read this post before gambling?

It is clear from what you say that all gamblers should have a limited amount to gamble in a casino or online. This is the frequent problem of a gambler, which is why it always leads to big losses in gambling. Those who don't know how much they will lose gambling in a casino.
But if we have a set amount to bet on gambling, we can also practice self-control and discipline in gambling. And if all gamblers can do this, for sure there will be many responsible gamblers, as long as we can afford the amount, even if we say a large amount, as long as we can win, and that's how simple it is to understand.