I watched this video twice to try to understand it. I will probably watch it a third time. The math is way beyond my level. If I were to work hard enough, maybe I could learn the mathematics, but it wouldn't be worth the effort.
Since I like physics so much, maybe I should have made that my profession. However, I think that I like computer programming even more. In the very early days of micro-computers, back in the 1970's, I seemed to have a talent for programming in the same way I had a talent for chess.
I think that my interest in physics comes from wanting to understand how the universe works. However, there are subtleties in the physical universe that are too deep for anybody but a physicist to understand.