Many people have their positions blown up. They say that they made a wrong judgment. In fact, it is not about whether you are right or wrong. You cannot always be right. Most of the time, you are wrong. The main reason for the position blowup is not setting a stop loss. Maybe after setting a stop loss several times, you find that you have stopped in vain, so you will not set a stop loss next time. You also find that you can hold the order back most of the time, which makes you more convinced that holding the order is right. But there will always be a time when you can't hold it back, such as 519 and 312. If you don't set a stop loss in advance, you can't go in even if you want to cut your losses. You can hold it back nine times, but it only takes one time to return to zero.
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