EURUSD breakout

What do you think are the core competitiveness of a good 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?

I have had a few positions liquidated recently, but fortunately the losses were not very large. I would like to ask everyone, is there any way to prevent liquidation? Is there any trading discipline?

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

Where should beginners start trading?