Comment by rramadass

This is a good question and my initial thought would be Atomic Physics and Cosmology.

A book like Modern Atomic Physics by Vasant Natarajan (2015) would be a good place to look - https://en.wikipedia.org/wiki/Timeline_of_fundamental_physic...

Finally, asking Google something like "what is new in physics since feynman lectures", Gemini gave me a helpful summary in its "AI Overview" which you can also try out.