people are gave some good answers.
it boils down to various large sites.
wikipedia(app) and reddit(app) are my top.
often time i just bang out a search and pinpoint the answer and trash the rest.
[deleted] stackexchanges and ycomb are some other popular sites.
quora used to seem attractive but information is questionable and the whole experience is trash.

gemini,bookmarks,chatgpt are some others. also libgen .