A $\nu$ hope

The Standard Model has been successful beyond expectations in predicting the results of almost all the experimental tests done so far. In it, neutrinos are massless. Nonetheless, in recent years we have collected solid proofs indicating little but non zero masses for the neutrinos (when contrasted with those of the charged leptons). These masses permit neutrinos to change their flavour and oscillate, indeed a unique treat. In these lectures, I discuss the properties and the amazing potential of neutrinos in and beyond the Standard Model. I review also the pieces of evidence that do not fit with the vanilla three neu- trino picture and the prospects to discover the physics that hides beyond the Standard Model (if any) using neutrinos.