I haven't realized it yet—market cap of 10,000 suddenly drops to 7,000 in the blink of an eye. This is the reality of trading—the account value can plummet faster than you can blink.

Sometimes the market is just like that; what seems like a simple trend can turn around and teach you a lesson. With such volatility, you realize that your understanding of risk is far from deep enough. No wonder seasoned traders always say to prepare yourself mentally—this feeling of market cap shrinking is more direct than any theory.

Today, let's just consider it tuition.