The contents of Docin and Baidu Wenku are relatively mixed, and they have recently launched e-books. Daokeba's content is relatively focused on humanities education, Zhike.com focuses on industry technology, and Zhouba.com focuses on Focusing on workplace experience, there are also MBA think tank documents focusing on economic management. There are also SCRIBD and DOCSTOC abroad. I looked at Green Forest, which focuses more on professional documents and translations, such as patents, standards, technology, law, industry reports, and consulting. The contents of reports, documents, etc. are clearer.
These are quite good document sharing platforms in China, each with its own characteristics!