The most common and common operation I have encountered is

After opening an order, I keep watching the market, get excited when it goes up a little, get nervous when it goes down a little, and finally my heart can't stand it and I just sell directly, then I come back after eating or taking a shower and see:

Hey, it's the original take-profit position! My thighs are broken!

If you don't do ultra-short trading, don't watch the market, just put the take-profit and stop-loss and ignore it. When watching the market, you can't do anything except pray, so why not go out and have fun!