I didn't say anything because I had little knowledge, so I read more, read more and record more. Recording is very important. Taking notes at will can deepen the impression. Famous aphorisms, encyclopedias of knowledge, social hotspots and so on can all be recorded. Of course, impromptu comments also have skills. For example, if you see a topic, you need to feel it intuitively first. Then expand association, and finally sublimate rationality. This is a pretty good comment. Knowledge lies in accumulation, and accumulation can make it thinner.