The ups and downs of the market sometimes have traces to follow, and sometimes they are unfounded. The standard for deciding whether to participate in the market is whether to find sufficient reasons to persuade oneself through one's own trading system, and these reasons are the necessary adjustments in the trading system to determine a complete set of transactions-Position holding-adjustment-defense-The goal "is indispensable, and blind rampage will only make one's trading disorderly, and everyone can accept unclear profits. However, only traders who can summarize clear losses can go further! Investment is a balanced art. Only by understanding trade-offs and trade-offs can one be considered mature and not burdened by stubbornness. Investors who are still confused about it should not worry.