Observations reveal the organization of the interstellar medium into filament networks. In molecular clouds, the densest filaments are identified as the precise birthplaces of solar-mass stars, while high-mass stars form in the hubs where the filaments merge. To understand the formation process of star-clusters, it is thus essential to describe the formation and evolution of filaments and hubs and their fragmentation into pre-stellar cores, the progenitor of stars. I will present theoretical and observational studies indicating the formation of filamentary molecular clouds at the edge of expanding bubbles. I will then show observational results suggesting the role of filament coalescence and hub-filament systems in the formation process of stars from low to high masses. I will also discuss our new study proposing the formation of the Sun along a dense molecular filament. We suggest that the host filament may play an important role in shielding the young solar system from a nearby supernova explosion while intercepting the required amount of supernova ejecta to explain the observations of primitive material found in meteorites.