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At the beginning, the granularity research is coarse, it doesn't matter, and it is slowly eliminated. For example, you can screen by industry, then remove some according to business model, and then remove some according to assets and liabilities, etc. In each round of screening, only the best ones are retained and the poor ones are removed.The logic of profiteering is less but better.

Don't feel good when picking stocks. After buying a bunch of stocks, the position of each stock is just a scratch. Even if you see it right, you can't make a lot of money if it rises sharply.For this great goal, keep fighting.

Your idea may be, anyway, if the east is not bright and the west is bright, it won't be a loss. If you think about it the other way around, you may feel terrible. It's not dark in the east and dark in the west, and it will always be dark, especially when the market falls.The logic of profiteering is less but better.