Trading courses and coaches are useless- true or not

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!

What is a perfect trading system? Or is there a so-called perfect trading system?

How to choose a platform, can copying or calling orders really make money?

What cognitive biases do we have to overcome?

Tell me how hard you have worked to make money in trading?