Resource Recommendations to systematically develop a foundation via Self study in Astrophysics/Astronomy? I am a high school senior (Grade 12) with a passion for Astronomy/Astrophysics. I already searched quite a bit here on the other questions on resources, but I couldn't find any that shows a concise, systematic order that one can follow. (I might have also missed it if so I do apologize. If it helps I do have quite a decent handle on AP-level Calculus and decent physics background.
So, I would like a systematic order of books, videos, resources of any kind that I could peruse to achieve a significant foundation (and ambitiously say up to a Graduate level?) in Astronomy/Astrophysics.
Thank You!!!
High School Senior

Your first mission is to concentrate on getting a good set of results from high school.  That really means not spending your time chasing astronomy and astrophysics yet.
Yes, this is what your parents and teachers would say, but you know, if you ever want to have the time, resources and maybe the chance to study and/or work in these fields you absolutely are going to need the very best high school results you can manage.  And even if you don't weant to study a B.Sc. or higher then you still need the resources and that means a decent job and career prospects.  Money is important, or as the saying goes &quot;No bucks, no Buck Rogers”.
So focus on that first.

a systematic order

For self study this is not needed.  I'd suggest not being systematic outside of a specific goal, like having to pass exams set by other people.
You need to differentiate between Astronomy and Astrophyics.
Astronomy is a kind of &quot;catch-all&quot; term for every possible thing you could study or observe about anything that goes on  outside of our atsmosphere and planet.  You can include geology, biology, chemistry, physics and just about anything else that can be termed a science, as well as engineering (you have to build stuff to do stuff - rocket science and telescopes of many types, etc.).  Astrophysics is then a subset of Astronomy focusing on the application of physics to astronomy.
Now you want graduate level or graduate level &quot;foundation&quot; as a target.  That means you want a B.Sc. level course.  As you want Astrophysics you basically need a B.Sc. level course in physics.  That's a lot of study.  You'll cover topics like:

electromagnetism
basic quantum theory
basic special and general relativity
basic thermodynamics
mechanics
optics

Keep in mind a systematic B.Sc. course on basic physics for astrophysics typically takes four full years.  You have to learn to think about physics problems and get a feel for how things are done.  That's arguably more important than the actual details of any particular theory.
Don't be distracted by glamor subjects like quantum theory and relativity.  Mechanics, Electromagnetism and Thermodynamics are very, very important.
So let's focus on astrophysics and understand that you have to start with physics and what resources will help.
Libraries
Great things, not loved or used enough.  One set I personally really useful was the Schaum Outline series as a launching point and if you can get anything from your library, borrow them.  You don't need to swallow books whole - read what you need and borrow again when you need more.  There are lots of books out there and for physics and we all have favorites (and ones we'd avoid ever reading again).  Boring old textbooks like e.g. Halliday and Resnick are as good a place to start as any.  My first exposure to quantum theory proper was by a book borrowed from my local library.
Videos
There are multiple courses on physics online.  A couple to consider :

Yale physics courses online
Leonard Susskind physics lectures

There's also excellent YouTube channels like :

PBS Spacetime
FermiLab
Sabine Hossenfelder

By no means the only ones.