Oh I found it. It's learn-anything.xyz. Source: about 1 year ago

I think I found something that looks and works like what you described: https://learn-anything.xyz/. If it's not that one then I'd also like to know what it is because it sounds really useful haha. Source: over 1 year ago

This one is my favourite, its not great for everything but most of the time it provides a solid road map to learning something new. https://learn-anything.xyz/. - Source: Hacker News / over 1 year ago

Learn Anything : Community curated knowledge graph of best paths for learning anything. - Source: dev.to / over 1 year ago

You may be thinking of https://learn-anything.xyz/. - Source: Hacker News / over 1 year ago

Https://mathigon.org/ Structure and Interpretation of Computer Programs. Interactive Version. - Source: Hacker News / 10 months ago

Https://mathigon.org All free. Some parts of the site are still under development. Source: 12 months ago

Look no further, gentle reader, than Mathigon, a most splendid facility for explaining and interacting with these basics. Source: almost 1 year ago

Khan Academy is great and covers many subjects. Quindew, Read Theory, and Read Works cover reading comprehension. School Yourself, Mathigon, and Wolfram MathWorld cover math. Xaktly covers math and science. If you like workbooks, there are several for high school here. All of those are free. Source: over 1 year ago

I like https://mathigon.org I don’t know if everything is translated to Ukraine though. Source: over 1 year ago