Massive stars, by which we mean those stars evolving through all the stable nuclear burning stages, play a fundamental role in the evolution of the Universe. Therefore, a good knowledge of their evolution and fate is required in order to shed light on many topical subjects like, e.g., the chemical evolution of the galaxies and the nature of the sources of the gravitational waves. In the last years three main questions - still debated - rised in the community working on massive stars. They concern the compactness of massive stars at the presupernova stage as an indicator of their explodability, the nature of the remnant after the explosion and the so called "RSG problem". In this talk I will try address these questions by reviewing our current understanding of the life and death of massive stars as a function of the initial mass, metallicity and rotation velocity.