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

Do you guys have any good suggestions to save novice Huiyou like me from taking some detours?

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

Winning ratio and profit-loss ratio, which one do you value more?

What cognitive biases do we have to overcome?

Traders, what moments do you feel "really broke"?