I'm writing this as someone who graduated about 20 years ago with a math background, but who is trying to learn physics as an enthusiast.<br><br>I learned some very cool things, for example, I finally learned what U1, SU2, etc were and why they show up in physics, and why symmetries are so important.<br><br>Given my background, I felt some of the things that got footnotes didn't (for example: "a circle is all points equidistant from a point") and other things could have used more elaboration in the appendices (for example: tensor product, Casimir operators, and  taking e to the power of a matrix,  it was a good thing I had seen the 3blue1brown video about that, I also didn't know that det(e^M)=Tr(M))