These lecture notes relate to the course on "Detection and phenomenology of cosmic neutrinos" held at the second training school on "Quantum Gravity phenomenology in the Multi-Messenger Approach" (COST Action CA 18108). The notes explore neutrino astronomy, covering its development, scientific motivations, and current achievements. We start with an introduction and historical context, delving then into detection techniques, and current telescopes. We conclude with some selected recent results in the field.