Thanks for the explanation, and for the book recommendation. I've been wanting to read a book on the subject for a while, but didn't know where to start, so if there's one available for free that's even better!
Ah, thank you! Yes, it sounds like I am missing that. I don't remember that term coming up in any of the videos I watched, and many of them kept talking about acceleration and changing one's inertial frame as if they were the same thing, which got really confusing, and left me thinking "that...
So I've been trying really hard to understand the theory of relativity at its most basic level lately, and recently I dove down the rabbit hole of the Twin Paradox. This has led me through a series of youtube videos, each one claiming to present a different solution, explain why the other...