Part I: Foundations -- Introduction -- Special Relativity -- Part II: Symmetry Tools -- Lie Group Theory -- The Framework -- Part III: The Equations of Nature -- Measuring Nature -- Free Theory -- Interaction Theory -- Part IV: Applications -- Quantum Mechanics -- Quantum Field Theory -- Classical Mechanics -- Electrodynamics -- Gravity -- Closing Words -- Part V: Appendices -- A. Vector Calculus -- B. Calculus -- C. Linear Algebra -- D. Additional Mathematical Notions.