True. Even if you have spent a great deal of time in the market, you could lose it all any time if you fail to understand and control your emotions.
Many traders master the skills and have enough knowledge to trade the market efficiently but still fail. This is mainly due to the lack of right trading psychology. Having a good emotional quotient is very important in trading.
Here is a good one about pattern recognition, which I believe is the ultimate edge in trading. http://traderfeed.blogspot.com/2022/07/the-key-to-successful-trading-psychology.html