after going through https://www.youtube.com/playlist?list=PL2ym2L69yzkamORF9DGWRhE9qUnb0_-6H https://www.youtube.com/playlist?list=PL2ym2L69yzkamORF9DGWR... i

after going through https://www.youtube.com/playlist?list=PL2ym2L69yzkamORF9DGWRhE9qUnb0_-6H https://www.youtube.com/playlist?list=PL2ym2L69yzkamORF9DGWR... i found i understood action much better. i kept thinking why the hell are the units "phase space" what does this even mean. How is that even connected to h_bar? But then following along the derivations to define the action and then the mystery kind of goes away. Understanding the machinery makes the magic real, but also evaporates the confusion. Like minimizing the action is interesting, but the real a-ha for me, was the derivation of the euler-lagrange and see how the functional equation actually works. Following the types, and compiling in my mind, gave the understanding.