Where should I start? Prior to March 20, I primarily invested in SG firms. My portfolio suffered a 40 percent decrease as a result of the covid-19 pandemic. I've been concentrating on the US market since May/June 20. As of March 21, my portfolio had broken even and had returned around 15%. But then "Bill Hwang" shows up, and my portfolio suffered a gunshot wound that can be recovered in a short period of time. However, I later became a Tencent and Baba shareholder. After that, we know what happened. My portfolio is currently severely in the red, with losses perhaps approaching 50%. Worse than the March 2020 decline. After all, the most crucial aspect of being an investor is to evaluate and comprehend what may have been done better. 1. Lack of Focus on Financials It still makes sense based on the qualitative way I examined companies...