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The book "Quantum field theory for the gifted amateur" is really good. It's helped me understand quantum fields a lot better, and I work with quantum mechanics every day.
What's the intended audience? Considering that you do Quantum mechanic daily, I assumed you studied physics and knew QED and QCD but forgot about it?
Got my master in theoretical physics 20 years ago, moved to experimental physics and now do engineering and applied physics , so I cannot anymore decipher my QCD notes
From its own cover,
This might sound pretty casual, but it gets into all the math of it, with an aim at practical use.
Nice, I`ll check it out, feel somehow frustrated to have forgotten all these stuff