I think there is just one main equation in Quantum Mechanics [1]. Learn how to work with that one equation and you are pretty much there. [1] https://en.wikipe

I think there is just one main equation in Quantum Mechanics [1]. Learn how to work with that one equation and you are pretty much there. [1] https://en.wikipedia.org/wiki/Schr%C3%B6dinger_equation https://en.wikipedia.org/wiki/Schr%C3%B6dinger_equation Of course, figuring out how to use that equation may require lots of work but I think that is pretty much it. I 'm no physicist but at least this is were I would start. It is similar in Electrical Engineering and Mechanical Engineering. In Electrical Engineering pretty much everything derives from Maxwell's equations and in Mechanical Engineering everything derives from Newton's Laws of motion. Everything else is just details.