>How do you guys know so much about all this crap. Are you guys space scientists?
I can't speak for the others, but in my case I'm just an EE. I got a good physics base as part of my degree, a lot of electromagnetism, and a tiny little bit of quantum mechanics from my semiconductors classes. The rest, I learned on my own because I enjoy it (which means that if I say anything a more knowledgeable person in the field disagrees with, take their word for it and please correct me. I'd like to know of any misunderstandings I carry).
If you also enjoy it and wish to learn more, let me make a few recommendations.
YouTube channels:
If you're ready to get deeper into it, WorldScienceU has a Special Relativity course taught by Brian Greene, complete with equations and math problems for you to work out. The only math pre-requisite is algebra (You'll want the "math based introuduction" under courses, instead of the "conceptual tour" if you want to learn the math).
If you want to get really deep in it, I'm currently reading Gravitation (MTW). It's a well-known graduate-level text book on General Relativity, but if your math foundation is high (college-level differential equations), it's more approachable than you'd think. The authors introduce the more advanced math, like tensors, as needed.