I don't think I would have graduated college without Khan Academy. For coding, MDN, Geeks4Geeks and W3Schools are also great.
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Here are some:
lifesciencedb.jp/bp3d ( human body parts in 3D )
plosone.org ( peer reviewed scientific journal )
gutenberg.net.au ( ebooks )
librivox.org ( audiobooks )
More general:
instructables.com ( DIY projects )
en.wikivoyage.org (travel guide)
foodista.com ( food recipes )
I'm a software engineer, for stuff that are related to library/programming languages, I usually try to look at the official documentation first. Some of the best documentation pages IMO are: SQLite, PostgreSQL, and Rust book. MDN is good too, like you said. Looking at the source code helps too, especially the test files. I currently write lots of Go (programming language) code, and IMO their test files are so good, and you can learn how some functions behave or how to use it.
Other than that, I actually starting to learn to draw too, and for that I, so far, use drawabox. I think it's a good starter for learning to draw--as it gives you the most fundemental stuff when drawing. (technically not online, rather a book, but just before opening this thread I found this resource for learning drawing perspective: https://ia801206.us.archive.org/34/items/PerspectiveMadeEasy/Norling%20-%20Perspective%20Made%20Easy.pdf)
I also wanted to start playing guitar, but haven't got the money to buy one, but from what I hear Justin Guitar is a good free online resource. Haven't used it though
Poe.com is great for all manner of learning through a chatbot. It's got like a dozen different models that are great for answering natural human questions. You know like the one's you used to be able to answer through a web search without wading through pages of BS that don't actually answer the question. You might consider double checking it with a search engine or a different model to help cut out on any hallucinations it occasionally has.
It's also got some image generators to play around with, but they aren't really useful for learning.
I give this link to anyone I know who struggles with tech literacy, and I've learned some things myself from some of the more advanced lessons. And it's all free.