Conversation so far:
what is the difference between a nova and a type 1a supernova
A type I Supernova is similar to a nova but the explosion is much more powerful. A Type I supernova has no hydrogen in its spectrum.
how are the supernova types classified
Astronomers classify supernovae according to their light curves and the absorption lines of different chemical elements that appear in their spectra.

Question: what are the types
Self-contained rewrite: what are the supernova types