How to build a reliable trend trading system? Let's discuss

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

What is a perfect trading system? Or is there a so-called perfect trading system?

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?

How to explain leverage in the forex market?

What books did you guys read when you created your own trading system?