managing your money in gambling is 10 times more important than having a big amount of money in gambling. you have to manage the bankroll in a way that you never bust out and that is the hard part otherwise anybody can come up with a large sum of money to gamble with and then lose it all.
Yes. Bankroll management and game selection are the two key ingredients. Choosing the right situation when the odds are in one's favor (+EV) and avoiding all situations where the odds are against one's favor (-EV) is key. And, proper bankroll management reduces the effects of variance (losing steaks) which allows a player to stay in the game long enough to take advantage of the law of large numbers.
All gambling is indeed only concerned about the defeat and victory. But I often see that they get a pretty big defeat than victory they think. So this all is something a problem to be solved in advance, after the problem is solved then what we will do in the bankroll then it won't end the same way as prior to bankroll management. So,. If you want to get something good then have to resolve problems that we haven't completed