sketchplanations:

Know your dashes: the hyphen, en dash and em dash.

OK, so you can get a little over the top about these, but I do notice when a hyphen is used to add a thought in text rather than the em dash which is obviously better made for it

— and much nicer than using parentheses (). And

to go the full mile

why not use an en dash when you’re separating your page numbers 1–5 or months May–Sep next time?

Didn’t spot that? 

– hypen

– en dash

— em dash

Most writing tools and OSes have tricks to do these automatically for you.