General company information can be directly searched in official website, but if you need financial reports of listed companies, you can only find them through wind, which is not available on other websites. Wind only has an institutional account, but ordinary students don't. Of course, you can also rent one from Taobao by the day.

Of course, many people's professional papers are obtained through personal practice in enterprises, so most of them are real data. Most of the data found in the general literature are far away from the present and cannot be used as arguments to support your point of view. You can pay attention to some government websites or the latest data released by the stock market.