Best way to identify trend for beginners

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?

Why do really successful traders never share their methods or strategies?

Why do many people in trading study Taoist or Buddhist theories?

How to distinguish between "noise" and "signal" in the trading field, and extract truly valuable information?

The financial market is flooded with a lot of information all the time, how can we extract something of real value from this information?

How to choose between opening a position through a breakthrough and opening a position with a pullback in trading?