Trading courses and coaches are useless- true or not

Dear Hui friends, how to solve the situation of small profits and big losses?

In the era of bad technical indicators, can you still make money from technology?

What are the advantages of weekly trading over daily trading?

Do you think EA will be a market trend?

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?