Loss and profit are both information fed back by the system

Trading must establish a reasonable and correct system. After the system is generated, it will bloom when the market blooms and bear fruit when it blooms. Everything is determined by the market. Profit cannot be equated with correctness, and loss and error cannot be confused together, because profit is the reward of risk, and loss is the reminder of risk. As long as your system is reasonable, it will give you profit within the trend, and at the turning point , bear the loss. Transactions without losses and costs simply do not exist. This is the fundamental reason for controlling positions.