Nuclear Magnetic Resonance.- A short introduction to Nuclear Magnetic Resonance.- NMR in magnetic single molecule magnets.- Structure, synthesis and characterization of contrast agents for magnetic resonance molecular imaging.- Basic concepts of Magnetic Resonance Imaging.- Phases, phase transitions and spin dynamics in strongly correlated electron systems, from antiferromagnets to HTC superconductors: NMR-NQR insights.- Muon Spin Rotation.- to ?SR.- Muon spin rotation of organic compounds.- Stochastic Landau-Zener model, and experimental estimates of dephasing time in molecular magnets.- Mössbauer Spectroscopy.- Basic principles of Mössbauer spectroscopy and applications.- Line shape of Mössbauer relaxation spectra.- Studies of spin fluctuations in single molecular magnets by using Mössbauer spectroscopy.