M dash VS. N dash
There are two types of dashes, the n-dash, and the m-dash. The n-dash is approximately the length of the letter n, and the m-dash is approximately the length of the letter m.
The shorter en dash (–) is used to mark the range of numbers or span of time. This dash can be read as "to" or "through."
The longer em dash (—) is used to separate extra information or mark a break in a sentence. This dash can function similarly to parentheses or a pair of commas, or in place of a semicolon or colon.
When using dashes on your resume make sure to remove the space in between the dash and numbers or letters.
Incorrect: March 2019 - May 2020
Correct: March 2019-May2020