The Goldstein book looks like a great resource. I think I am going to buy a copy and put some time into that. I've been successful in the past with a few tough subjects (e.g., quantum computing) by finding more "niche" textbooks that cover topics from a slightly different angle or with a...
I am a software engineer/mechanical engineer highly intrigued by the Principal of Least Action. However, a lot of the material on this subject is very tedious and painful to read. I did find one super awesome textbook called The Lazy Universe, by Professor Jennifer Coopersmith. It was an awesome...