Gold market analysis

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?

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

Why can you see the general direction right, but make a bad point in the transaction, and lose money instead?

Profitable & consistent daytraders, how much did you lose before making it?

Curious to know how my fellow traders are doing out there What is your personal amount/story?

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