I assume that people come to the gambling industry as inexperienced people. And in the process of their activities, they gradually learn from their mistakes. Unfortunately, some of these mistakes are dramatic and cause us quite serious psychological trauma. As a rule, this is due to gross errors and stupid persistent beliefs that push us to the edge of the financial abyss.
First of all, this is risk management and money management. The second is probably unsystematic play. Let me make a reservation that I do not mean casinos, as well as people playing "for fun". I mean sports betting.
So, how much did your mistakes cost? Did they cause you a serious psychological blow? What were your mistakes, did you learn from these mistakes and do you apply this knowledge in practice now? Were these mistakes simply painful, dramatic or catastrophic?
Every analytical mistakes or mistakes you make while sticking with your plan are never huge. Even if you are making mistakes or losing your bets, you are mostly in control.
The worst kind of mistake a gambler makes is a rage bet. One where you go all in with everything you have. I have been through it and I know how mentally challenging the subsequent circumstances are. Some people die due to the mistakes they made. There are some addictive gamblers who on the rage did homicides and many who did suicides. It's easy to dismiss it as a bad uncontrolled decision but many experienced gamblers too could fall for it any day. Everyone should be cautious and strong stick to their budgeting when it comes to gambling.