The DXY, Where to HTF?

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

I have been unable to set the stop loss in the transaction, how can I do a good stop loss?

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

In the era of bad technical indicators, can you still make money from technology?

If you want to make money in trading, what principles do you need to understand?