"An Introduction to Quantum Field Theory" by Michael E. Peskin and Dan V. Schroeder is recognized as a standard textbook in quantum field theory (QFT), widely used in universities. The book is comprehensive and detailed, making it a valuable resource for mastering QFT, particularly in high energy physics. However, readers may struggle to maintain a clear understanding of the overarching concepts due to the dense formulas and intricate calculations. While the chapters on renormalization, symmetry breaking, and gauge theories are well-executed, the book has notable shortcomings, such as a poor treatment of the functional integral formalism and insufficient coverage of representation theory for groups like Lie groups and the Lorentz group. Despite its challenges, the book remains a classic and essential read for QFT enthusiasts, emphasizing calculation skills, although it contains numerous typos and foundational issues, including errors in the chapter on the renormalization group.