The book starts with the basics of classical field theory and moves systematically through the quantization of scalar, spinor, and vector fields.
One of the most conceptually challenging parts of QFT is renormalization—the removal of infinities. Nastase handles this with clarity, explaining: introduction to quantum field theory horatiu nastase pdf
If you are following the book or the associated PDF, you can expect to master: The book starts with the basics of classical
Explaining how physical constants "run" or change depending on the energy scale. and topology A: Yes
Pathologies, anomalies, and topology
A: Yes, specifically for advanced undergraduates who have taken quantum mechanics (at the level of Griffiths) and special relativity.
Would you like a comparison with other introductory QFT books (e.g., Peskin, Schwartz, Srednicki) instead?