These are my notes on the "Introduction to Field Theory" course given at Durham University in 2019. The course is an introduction to quantum field theory and could just as easily be called QFT1 or something. It starts from the motivation for QFT, studies free theories, and then presents Feynman rules in order to study interacting field theory. Spin-0 and Spin-1/2 particles are addressed. Spin-1 will be addressed later in a QED course.
The course was taught over 4 weeks and lasted 24 hours.
These are now done (up to minor corrections etc.)
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