Zhihu

Zhihu is a Chinese question-and-answer community known for long, considered answers rather than quick replies — closer in character to a written forum than to a social feed.

It is a good place to find domain explanation in Chinese: technical topics, industry practice, legal and financial questions often get answers from people who work in the field, with reasoning laid out rather than asserted.

As with any large community, quality has become uneven as it grew, and commercial content is common. Checking an author's credentials and the answer's date matters, since older highly-upvoted answers can describe conditions that no longer hold.