I am recently trying to study the calculation on one-loop diagrams in QED. Since the most resources i found where rather cryptic since they where very very general i wanted to ask whether or not there are good papers or textbooks about that topic (especially for beginners)?
My Background: I am a student in the 6th semester in physics. I do know how to calculate tree level feynman diagrams but i have only little understanding of QFT in general (Quantised Klein-Gordon-Field and classical field theory).