I will briefly review the studies on supernova host galaxies, focusing on the metallicity and the association to star formation of core-collapse supernovae and in particular of the circumstellar-interacting events. The different types and subtypes of interacting supernovae have different environmental properties, pointing to a multiplicity of progenitor channels. Long-lasting Type IIn supernovae exhibit metallicities that are similar to those of the supernova impostors, which in turn arise from luminous blue variable stars. Fast-declining type IIn supernovae are characterised by higher metallicity. Untargeted surveys like iPTF and ZTF will help us to improve on the knowledge of the environmental properties of these interacting supernovae.