These are books to train physicists, accessable-ish to a math heavy engineering undergraduate degree holder. The insights above are my own and extractable from this material but not necessarily stated out loud (unless I'm unconsciously plagiarizing which is entirely possible)

* David Griffiths - Introduction to Elementary Particles

* Chris Quigg - Gauge Theories of the Strong, Weak, and Electromagnetic Interactions

And the wonderful Richard Behiel's videos on YouTube https://www.youtube.com/watch?v=8Iu74b5iCuQ