Anyone trade with a new broker

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?

Do you think EA will be a market trend?

What would you say to yourself if you went back to your first day in trading?

Ask for advice on how to manage trading positions in order to achieve long-term stable profits?

How to choose a platform, can copying or calling orders really make money?