En Dash (single dash) usage is not standardized for literature to my knowledge, and is primarily used as a divider for ranges, in lieu of the word “through.” E.g. The year 1998-2006 (or 1998 - 2006) can be used in lieu of “The year 1998 through 2006” in text. It’s also used to denote negative numbers and compound words, of course. It can also be used to denote relationships, E.g. - The Johnson-Winters wedding party, or the Osea-Belkan War.

Informally I’ve read that a a single dash can be read as a half-beat, shorter than a comma, but I don’t think it’s actually defined in style guides for writing.

Fun fact: En Dashes and hyphens are not the same thing, though often used interchangeably, while a double-hyphen is often considered an exact equivalent to the em dash.