Is financial trading a profession?

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

For the real-time market, should we keep our original intention or follow the trend?

How to choose between opening a position through a breakthrough and opening a position with a pullback in trading?

Is the daily chart too big for trading? What is the best cycle time?

What books did you guys read when you created your own trading system?