10-year US Treasury bond yield rises to 5%

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

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

Can retail investors make a lot of money by trading? How can I earn it?

What should I do if I am about to liquidate?

How to understand the phrase "the simpler the trading system, the better"?

What is the degree of simplicity here? Or the simplicity here is not what I thought, just use a few indicators, so what do you think of this sentence?