After the ground-breaking detection of gravitational waves (GWs) from merging binary black holes (BHs) during Advanced LIGO first observing run, the field of GW astronomy made the big leagues with the dazzling discovery of the binary neutron star (NS) merger GW170817. In this talk, I will review what we have learned from recent GW detections, what questions remain open, and what are the prospects for future multi-messenger studies of the transient sky.