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 at the blackboard in the morning and are integrated with hands-on and discussion sessions with an instructor in the afternoon. The School will profit of the Galileo Galilei Institute facilities. Each student will have office space to study and discuss, with a lot of opportunities to interact with lecturers. Accommodation in shared apartments will be provided at the cost of about 300 Euros for the whole period. Scholarships to cover this expense are available upon request. Lunch will be provided during the weekdays on the GGI premises for students and lecturers, at no cost. All the dinners and the lunches during the weekends, instead, are to be covered by the participants.