Thanks! Yeah, I honestly find that (in my experience) university courses also often tend to get bogged down in examples too far detached from the observable physical world, which can make them demotivating. In my time at the university, I especially found the mathematics courses lacking, as they would focus almost entirely on formal descriptions and rote learning, and avoid using proper examples on the applications of mathematics in the real world. I'm a trained engineer/scientist, not a mathematician. It is the universal language used to describe so much, and yet I would spend my time solving Fourier integral after Fourier integral, not really understanding what I was really doing until it showed up in a physics course later on and within 20 minutes I would have a much better intuition of what I was spending 6 months trying to learn before.
And regarding beta-reading - that could be useful in the future, but as I said, it is first and foremost a personal project for my own enjoyment. But if it turns into something that looks like it could be of value to others as well (i.e. structured, coherent, complete and factually correct enough), I might prioritize trying to get that to a publishable state.
Cheers :)