Ask HN: What is a good lecture series on physics?

I'd suggest "The Mechanical Universe", which was an excellent series of video lectures developed at Caltech in the that covers undergraduate physics.

It was created in the '80s and broadcast on PBS and it still holds up well today.

Leonard Susskind's The Theoretical Minimum is a favorite of mine. There's a series of lectures on Youtube that accompanies the books.

Check out L.D. Landau's Course of Theoretical Physics if you're open to reading a textbook.

At least some of the Feynmann lectures are available on video. (All of them, I think, but I could be wrong.)