Important Note. These are my personal lecture notes, that I prepared for my personal use as part of the preparations for teaching this module. I post them here for the sole purpose of assisting the students learning this fascinating, yet difficult subject.
I make no claim of originality. I am basing a large part of the text on the lecture notes of David Tong, which are freely available here. Other major resources I used are the books by Michael Peskin and Daniel Schroeder and, to a lesser extent, by Steven Weinberg, Lewis Ryder and Anthony Zee. I also used my personal notes from the courses taught by Yosef Nir, and by Adam Schwimmer.