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On Windows, use wincompose. Space followed by a hyphen gives you an emdash with the cute half-width spaces around it. On Android, I can get an emdash by long pressing hyphen. There's also a keyboard shortcut on the mac for it. No idea about Linux/BSD or iOS, unfortunately.

On Windows I also use QuickAccent, now part of PowerToys. I could never remember the Alt-code for the em dash. Apparently it's Alt-0151. With QuickAccent I hold a letter and right or left arrow and up comes a menu of related symbols. It's pretty neat.

On Mac, it's option-shift-hyphen. Option-hyphen gives the en dash.

On Linux, you may be able to type Ctrl-Shift-U to get unicode entry and type 2014 and Enter. 2013 is the en dash. Again, I will never remember that.

In Linux if you enable the compose key it’s the compose key followed by 3 dashes.

cute little half-width spaces?

https://en.wikipedia.org/wiki/Whitespace_character#Hair_spac...

On Linux, it's whatever you say it is, after reading through `man xcompose`.

on a Mac, it's Option+Shift+-

— (em dash)

Option+- gives you an "en dash": – which is longer than a normal hyphen.