Fun fact: the reason the en and em dashes have those names are because of their lengths. An em dash is about the length of the letter m, and an en dash (surprise) is the length of the letter n. Isn’t that fun? Now you have a conversation starter for cocktail parties.
The en dash is used when connecting ranges, and it replaces “to” in those ranges. You might have relatives aged 2–52, or a flight to catch from Austin–Detroit, or a baseball game that your team wins 4–2. In all of those circumstances, you would be using an en dash.
Write for fifteen minutes about someone running to catch a flight. Use hyphens, en dashes, and em dashes to describe what caused the delay, where they’re going, what bar they’re going to when they finally get to their destination. (Note: The comments box may not be able to distinguish between the three. Feel free to use a word processor and paste as needed.)