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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!

Do you guys have any good suggestions to save novice Huiyou like me from taking some detours?

Can retail investors make a lot of money by trading? How can I earn it?

Is there a future for giving up your studies and doing business?

What do you think are the core competitiveness of a good broker?