This is an ideal one for a new comer in the science of Quantum Field Theory. It discusses the transition of Quantum Mechanics to Quantum Theory in great detail. The book teaches Path Integral Formalism and also throws light on Modern concepts Ghost Fields etc. The book also explores the concept of function and functional. Obvoiusly it does not go to discuss Functional in such a detail as that of the book on QFT by P Ramond. The book also throws light on Gauge Field Theory, Symmetry Breaking and Electroweak Interaction. Altogether the book is one of the best 'buy's for a Graduate Student in Physics. Personally I have been refering this book right since Graduate days till today for last tweleve years.