Last year, an interviewer asked Francis how he envisages hell. His response stayed with me: “It’s difficult to imagine it. What I would say is not a dogma of faith, but my personal thought: I like to think hell is empty; I hope it is.”
Most of what we know as hell comes from depictions by Dante and Milton. Things like fallen angel Lucifer, battles between heaven and hell, the apocalypse and rapture, etc. are noncanonical.