This lecture covers the Landau-Lifshitz-Gilbert equation, GHz spectroscopy, and microwaves on the nanoscale. It discusses magnetization dynamics, precessional motion, spin waves in thin films, scattering parameters, ferromagnetic resonance, and microwave-to-magnon transduction. The lecture explores the dispersion relations of spin waves in different thicknesses of YIG, Yttrium Iron Garnet properties, and future magnetic technologies focusing on rare earth magnets and spin wave control on the nanoscale.