Renormalization in Quantum Field Theory is a complex subject. I tried to collect the accessible explanations. I hope this helps.
John Preskill in “We are all Wilsonians now”
Renormalization for philosophers
Consider these as well:
https://arxiv.org/pdf/1208.4700.pdf
https://en.wikipedia.org/wiki/Renormalization
https://www.physics.umd.edu/courses/Phys851/Luty/notes/renorm.pdf
Suresh Emre
Renaissance Universal 