Market View on USDCAD

Seeking expert guidance, what is the difference between left-hand trading and right-hand trading?

What is the essence of trading profit?

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?

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?

I resigned yesterday, due at the end of the month, I want to do trading full-time, but I don’t know how far this road can go?