HYPHEN?  EN-DASH?  EM-DASH?
Miss Grammar Person can help

THE HYPHEN
Keyboard = Hyphen key
Smaller than the width of an "n"
Used for...

1. Compound word: three-year
2. Broken word: infor-
mation
3. Separation of non-inclusive numbers: 708-597-6800

THE EN-DASH
Mac = Option + Hyphen key
Windows = Alt + 150
Used for...

Separation of inclusive numbers, as in:
1968–72
(but never: “from 1968–72”; instead: “from 1968 to 1972”)
May–June 1967
John Doe (1940–)
(preferred: “John Doe (b. 1940)
winter of 1998–99

THE EM-DASH
MAC = Shift + option + hyphen
Windows = Alt + 151
Used for...

1. A sudden break in thought a further explanation
Farley—the rat that he was—walked home.
2. Dialog that is interrupted
“Mabel,” said Sally, “I hoped you might—”
3. The end of a collective pronoun:
Red, green and yellow—these colors were my palette.