Trading is not just to think about profit, let alone big profits in an instant, that's a big mistake, even though you have good knowledge without being able to control your emotions, of course everything will destroy you.
I think the most valuable knowledge in trading is personal experience, be it bad or good. because the rush to take as much profit as possible is a common desire of all people without realizing it will be a boomerang to turn things around to cause losses for themselves and it will not be controlled if traders can not control themselves properly.
I think it is the most important thing in trading, being able to control emotions well.
I agree that being able to control our emotions is really needed in trading and investing, controlling our emotions is not easy to master because we will panic easily when the bear market happened. Also keep in mind that the funds that you use are that you can afford to lose to decrease your depression when your portfolio is all in red.