Explore the intricate world of neutrino quantum kinetics in neutron star mergers through this comprehensive lecture. Delve into the formation of accretion disks following compact object collisions and their role in producing heavy elements and observable kilonovae. Examine the critical influence of neutrino transport on ejecta composition and kilonova appearance. Investigate the complexities of neutrino flavor transformation induced by neutrino-neutrino interactions. Learn about cutting-edge research combining global general-relativistic neutrino radiation transport with microscopic neutrino mean-field quantum kinetics. Discover multidimensional simulations of neutrino flavor turbulence, methods for predicting flavor change instability, and the inseparable nature of collisions and flavor transformation. Gain insights into linear stability analysis, plasma instability, and the scale of these phenomena through detailed simulations.