Had similar thoughts and I named it knowledge graph.
The center is you, than you tag books, lectures, wikipages and have a visual representation of all of your knowledge.
I also imagined having your whole education in it and because it's a graph, you could import a path which you can follow. 1+1 needs to be done before you can do 1*1 etc.
I thought about it while learning for a university course and a lot of time was spent on finding good material which explained a topic. And after the exam I started to forget stuff again.
It felt really stupid.
I wanna be in control on what I know, what I want to know and what I no longer need to know.
And all tools out there are not that good. Anki is doing its job but nothing else. Memrise does it more playful but also misses stuff. Duolingo (most of online learning has this problem) feels more like 101 <topic>.
How is it possible that 1000thands of universities record videos of lectures every year and are often paid by all of us (Germany for example) but all those videos have one or all of the following issues: - bad audio - bad video - horrible handwriting - no slides
Should it not be possible to sit together and create small topics and build one ONE comprehensive learning page?
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Edit: and such a platform could not only benefit a lot of people it would also be financially a good deal. From 1-6 grade it could support parents and teachers, than teachers and pupils and later profs and students.
Lots of knowledge doesn't change every year.