PBS Space Time has done a couple of episodes on Stationary Action and Noether's Theorem that are approachable by those not yet already exposed to Langrangians:

https://www.youtube.com/watch?v=Q_CQDSlmboA

https://www.youtube.com/watch?v=04ERSb06dOg

Sabine Hossenfelder also has a good episode on it:

https://www.youtube.com/watch?v=A0da8TEeaeE