Fundamental interactions in nuclei (strong, weak, electromagnetic); Basic concepts in scattering and reactions (cross section, form factor); Nuclear charge density and radius (electron scattering, muonic atoms, mirror nuclei); Nuclear masses (Bethe-Weizs¨acker semi-empirical mass formula, stability of elements); Fermi-gas model; Angular momentum and parity; Electromagnetic moments, hyperfine interaction; Nuclear force and two-nucleon systems (deutron, tensor interaction); Isospin (charge symmetry, charge independence, Isobaric Analogue States); Nuclear excitation and decay (electromagnetic transitions, alpha and beta decays); The shell-model (magic numbers, residual interaction); The geometric collective model (spherical vibrator, deformed-rotor); The algebraic interacting boson model (dynamical symmetries).