Canon levels

Canon: anything that happens in a show or a series, there will be recon and continuity errors depending on how long the show runs and who’s making it at the time.

Word of God: something the creator said, but is not shown in show is most likely canon. Can be contradicted by something in the show making it non-canon.

Soft canon: comic books and video games and other expanded media probably not canon unless directly referenced in the show.

Non-canon: literally anything that isn’t made by the show runners or other people working on expanded media projects related to the show, or things like commercial advertisements