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What are the stupid behaviors in trading?

Let me tell you one thing, unplanned trading is the most stupid trading behavior. Follow your own ideas, enter and exit the market casually, and don’t do a good job of stop profit and stop loss. This should be the most mindless behavior!Have you seen any other stupid trading behaviors? Either your own or someone else's! Welcome to add, as a standard for our transactions!

Fund management has always been a headache for me. May I ask you guys, how can I do a good job of position control?

How do you view the theory that review is useless?

How to solve the conversion between large cycle and small cycle?

Why do really successful traders never share their methods or strategies?