I joined Moomoo and started investing in the stock market in mid-2021 and made losses due to mistakes like relying on rumors instead of doing proper research. I bought stocks at their peak, hoping for quick gains, and when prices dropped, I kept averaging down, not realizing I was worsening the situation. My ego and lack of strategy led to losses, and even when I picked the right stocks, greed stopped me from taking profits, which were eventually wiped out by market downturns.