- A great discussion of general wave properties and dispersion can be found here. Moreover, a great book on classical waves is The Physics of Waves by Georgi.
- A more detailed discussion of symmetry breaking and the Higgs mechanism is available here and here.
- To learn more about the philosophical aspects of the renormalization group and related topics, a great starting point is Renormalization Group Methods by Williams.
- If you want to learn more about spinors, try Spinors for everyone by Coddens and An introduction to spinors by Steane.
From the book No-Nonsense Quantum Field Theory.