What categories should be included on a website of general knowledge?

All of them. But the search engines and Wikis beat you to it.

It’s all right here

Politics
Relationships
Tecnology

Technology
Business
Entertainment
Research
Sports
I think these are the most important & interesting topics forever.

Hentai.

Art & literature
Geography
People
History
Science & Nature
Sport
Politics
Music
Film & Tv

Psychology is the only thing I don’t see mentioned already by other jellies.

Dewey figured it out a long time ago. The ten categories:
1 Class 000 – Computer science, information & general works
2 Class 100 – Philosophy and psychology
3 Class 200 – Religion
4 Class 300 – Social sciences
5 Class 400 – Language
6 Class 500 – Science
7 Class 600 – Technology
8 Class 700 – Arts & recreation
9 Class 800 – Literature
10 Class 900 – History & geography

Health

@zenvelo See my link