I am an undergrad interested in HEP-Th. I have studied canonical quantization, and path integral approach for quantizing fields, and the EM field quantization, classical yang-mills theory. I want to learn RG, especially for its utility in HEP. What are the topics that I should learn to get to it, and could you suggest parts of a reference. I know that Peskin and Schroeder is the canonical reference, but I don't know where to start and what is necessary. There seems to be a lot of chapters before I can start RG: radiative corrections (chapter 6 and 7?), systematics (chpt 10), symmetry (11).
How is it organized and what should I read?