Trading courses and coaches are useless- true or not

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

How to distinguish between "noise" and "signal" in the trading field, and extract truly valuable information?

The financial market is flooded with a lot of information all the time, how can we extract something of real value from this information?

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

What is the essence of trading profit?

As a trader, how can you make a stable profit?