It can be hard for people to know the difference between the three dashes. Some people don’t even know there’s three different types.
Luckily, I’ve set out the general grammar rules to follow below:
Em dash —
The Em dash is the length of an ‘m’. Em dash can be used instead of a colon, to indicate missing words or draw more attention to a sentence. For example, Early intervention—the best chance of success.
En dash –
En dash is the length of an ‘n’ and is used for a range. For example, 1–10, January–March.
Hyphen, well, everyone knows what a hyphen looks like. It’s used to join words together. For example, mid-January, non-responsive.