Why Do We Need Quantum Field Theory After All?.- From Classical to Quantum Fields.- Theories and Lagrangian I: Matter Fields.- Theories and Lagrangian II: Introducing Gauge Fields.- Theories and Lagrangian II: The Standard Model.- Towards Computational Rules: Feynman Diagrams.- Symmetries I: Continuous Symmetries.- Renormalization.- Anomalies.- The Origin of Mass.- Symmetries II: Discrete Symmetries.- Effective Field Theories and Naturalness.- Special...