There are some good rules here only.
Not chasing losses is like the first and foremost thing. Because gambling addiction starts from chasing the loss only and with the false hope that one can win money on every bet.
Dont follow any leaderboards. They are only made to make your ego inflate. If you follow this, then you will keep losing money again and again.
This first ruel also covered avoid not getting greedy, if a gambler is less greedy they won't have to chase losses if they lose and when they win they will be satisfied with the amount.
Also gamblers who aren't greedy focus on a game or two but those greedy gamblers have no focus, they jump from a game to another thinking it will increase their chances of winning.
The best behaviour a gambler can have is been contented with what you have or gain out of gambling, been less greedy just covered everything in gambling, talking of risk tolerance as well.