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:

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=Q_CQDSlmboA https://www.youtube.com/watch?v=04ERSb06dOg https://www.youtube.com/watch?v=04ERSb06dOg Sabine Hossenfelder also has a good episode on it: https://www.youtube.com/watch?v=A0da8TEeaeE https://www.youtube.com/watch?v=A0da8TEeaeE