Review of Classical Field Theory: the field viewpoint, Lagrangian and Hamiltonian description of classical field theory, concept of symmetry, Noether theorem, conserved current; The Klein-Gordon Field: review of notation of special relativity, Klein-Gordon field as harmonic oscillator, Klein-Gordon field in spacetime, canonical quantization, causality and propagators; The Dirac Field: Poincare algebra, Lorentz invariance of Dirac equation, free particle solution of Dirac equation, Dirac matrices, Grassmann numbers, canonical quantization, spin, Dirac, Weyl and Majorana spinors, discrete symmetries: parity, time-reversal, charge conjugation, CPT theorem; Maxwell Field: unitary representation of Poincare group, electromagnetism as gauge theory, gauge covariant derivatives, photon propagator, different gauges; Interacting Fields and Feynman Diagrams: perturbation theory, perturbation expansion of correlation functions, Wick’s theorem, Feynman diagram, Cross Section and S-matrix, quantum electrodynamics, LSZ reduction formula; Elementary Processes of Quantum Electrodynamics: electron-electron to muon-muon scattering, helicity structure, crossing symmetry, nonrelativistic limit; Radiative Corrections: infrared divergences, regularization, Ward-Takahashi Identity, optical theorem.