Is there the dumbest and easiest way to trade stocks?

Is there the dumbest and easiest way to trade stocks? #Brilliant Pen Creation Challenge#

I once heard a colleague speculate in stocks like this, he only buys one stock is Yili milk, buy when Yili milk falls 15%, sell when it rises 15%, and make money in a year.

He also said that you can't be greedy, you can't take a full position, and you can operate at most one-third of the position, in case of a big fall, you can cover the position.

I don't know if his method is feasible, it should be possible in theory, in practice, it depends on whether you can endure loneliness, you have to wait patiently for buying and selling points, and you have to bear the sense of loss after selling flying.

Warren Buffett said a classic saying: No one wants to get rich slowly. Indeed, watching others buy large bull stocks several times a year, do you see this small profit?

In fact, for most shareholders, you must calm your mind, don't always think about getting rich overnight, this is impossible, your greed will one day make you lose decently. The only thing you can do is sink in, wouldn't it be great if you could make yourself rich slowly?