I will review key connections between extragalactic supernovae and resolved supernova remnants that provide valuable information about supernova progenitor systems, their nearby environments, and supernova explosion dynamics. Links between long-lasting, “middle-aged” (10–100 years) supernovae and young (<1000 years) supernova remnants that uniquely inform about the origins of explosive mixing, high-velocity jets, and the formation of dust in the ejecta will be highlighted. I will conclude with a discussion about future facilities that will enable transformational progress to be made on our understanding of the SN-SNR transition.