The use of supernovae in cosmological contexts has been in the spotlight for a couple of decades now. My first interest in these objects was to investigate their ability to provide cosmological insights. Consequently, I have been working on type Ia supernovae as standard candles: their observational and statistical challenges. I am also interested in any kind of astrophysical feedback due to supernovae, such as their influence on the dark matter profile of dwarf galaxies.