There are dozens of pattern changes in a day. Even if you know the important support and resistance points, you will be scared to death by each callback, mistaking the retracement for a callback, and mistaking the callback for a retracement. It is really difficult to distinguish. This is also why most KOLs let us buy low and sell high to make a profit and loss ratio. But it seems that there are not many good points for short-term trading.