What if there was just one place, one rule that ruled the…

https://www.musical-u.com/learn/the-secret-to-mastering-music-theory-with-shranny/
What if there was just one place, one rule that ruled them all, one secret to understanding all the key signatures, chords, chord progressions—even those awful, endless scales?
https://www.musical-u.com/learn/the-secret-to-mastering-music-theory-with-shranny/