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This lecture introduces the concept of symmetries in particle physics, focusing on parity (P) and charge conjugation (C) symmetries. It covers topics such as the transformation properties of fields under P and C, fermion quantum numbers, chirality, and the relation between helicity and chirality. The lecture also discusses meson parity, charge conjugation in the Dirac equation, and the symmetries of Quantum Electrodynamics (QED). Examples of beta decay and kaon decays are used to illustrate the application of symmetries in understanding particle interactions.