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?
Most gamblers already know about this philosophy but fail when implementing it because gambling is often out of control.
Players have a budget but often fail to comply with it, especially when the usual casino where he plays is giving tempting promotions even though at that time he has exceeded the budget.
Players often feel the need to quit but losing or even being in a winning position gets in the way because thinking it's not the right time to quit until eventually running out of money is what forces them to quit.
Drugs or drinks are only carried out by heavyweight gamblers and maybe even they are addicts, be they gambling addicts on drugs or liquor.
Not many players dare to admit that they are not doing well because of gambling, maybe because they don't like being advised or being blamed.
There are many things that other people can think about including considering gambling as a way of multiplying money or as a way of earning, anyway thanks for advice.