The school will cover the emerging field of gravitational and multi-messenger astronomy, following the discovery of GW150914 and GW170817. We can soon expect many other detections, which will open up a new window on astrophysical objects such as compact binary systems (black holes, neutron stars), supernovae, pulsars, a stochastic gravitational wave background, or even unexpected objects. The objective of the school is to provide a large number of students with a solid corpus in most aspects of the field.