We discuss how the star formation influences the evolution of galaxies. Processes in the ISM combine the gravitational instability with hydrodynamical instabilities triggering formation of stars. Various feedback processes operating in the star forming regions such as stellar winds, ionising radiation, and supernova explosions produce bubbles of hot gas containing yields of the stellar evolution surrounded by expanding shells composed of the pristine material of the original molecular cloud. We discuss the hydrodynamics of winds of massive star clusters. We propose a bimodal solution, where the thermally unstable region may be the place of secondary star formation. The possibility of super winds blowing to large distances from parent galaxies is also mentioned.