Strategy system setup very important for successful traders

Why can you see the general direction right, but make a bad point in the transaction, and lose money instead?

The market often has some good and bad news, how should we generally treat it?

What should I do if my trading system encounters a retracement?

Ask for advice on how to manage trading positions in order to achieve long-term stable profits?

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