DowJones Daily Chart Signal

In the past few months, I feel that the more I study, the more I study, but it will decline. Sometimes I feel conflicted. I don’t know why?

What do you think are the core competitiveness of a good broker?

In trading, how to solve the problem of being hit by the market back and forth with stop loss? What is the basis for the solution?

What kind of system can accurately locate support resistance and trend when doing transactions?

I have had a few positions liquidated recently, but fortunately the losses were not very large. I would like to ask everyone, is there any way to prevent liquidation? Is there any trading discipline?