Discipline, risk management and other things will be important for any gambler. They can not just hope to win the games but they should take care of themselves to avoid a big loss. They have control over themselves so they don't spend more money on gambling because they can see the chance of losses will be there.
There is a lot of talk about discipline but you have to have a clear idea of when you are going to play what you should do in any case where you could lose control, you have to have a backup plan in case your money runs out or you spend more than normal, it is Advisable to have control of how much time and how much money you have to spend, that is the first basis for having good discipline in the game, losing large sums of money is what you should avoid.