In this case, if you want to understand how stuff works, you should explicitly look for things that are not labeled "tutorials" - often textbooks will be a decent example, covering the principles and theory behind these abstraction layers which you'll then use in practice.
Like, in ML there are books which work through a basic implementation of all the algorithms using just the matrix multiplication primitives of matlab or numpy, and that works well as a learning exercise, but in practice everyone would rather use a highly optimized (but thus complicated less understandable) library maintained by others.
Similarly, in cryptography, there are textbooks which will work you through an implementation of the core algorithms, but again, a tutorial teaching how to do stuff in practice would not (and definitely should not) cover making your own implementations for cryptographic operations, but rather describe how to use a properly verified library.