The School aims at providing robust and detailed introductions on the basic theoretical concepts and main tools to work in the field of Astroparticle Physics, Cosmology and Gravitation. Gravitational waves of astrophysical and cosmological origin, neutrino physics and astronomy, dark matter and dark energy, galactic and extra-galactic cosmic rays and gamma-rays will be some among the main topics, and will be alternated along the years. The courses are organised as lectures and are integrated with hands-on and discussion sessions with an instructor.