I learned a lot of practical skills from YouTube, and as for other skills and knowledge - it's Google (never Wikipedia, by the way; I am surprised you take it so seriously as promoting its analog for Nost, and I went through comments, didn't see anyone mention it so far)

I didn't learn much from here https://archive.org/, but I hope it will thrive and store tons more information. That's the 'Wikipedia' I would love.

just life, still learn day by day

4chan /pol

Twitter. But hopefuly, #NOSTR when it's working better. Shadow ban is serious on twitter.

Twitter, YouTube, Arxiv are some