Ask HN: Why are there almost no intermediate-level learning resources?

My experience with learning almost any new language / framework / library goes like this:

1. There are plenty of beginner tutorials. Often they just go through the examples from the docs or show a very simple proof of concept. Not very useful if you can read the docs.

2. Then you are left on your own reading through uncommented GitHub repos to understand how to put these things actually into production for use cases that go beyond 'add a todo to this list'.

You almost never find tutorials on how to structure your application, best practices, common mistakes etc.

That's the knowledge that is really helpful though and that I would pay $$$ to learn. Not 'how to create a simple todo app'. Why are there barely any learning resources that target the intermediate level?