University of Ottawa (Canada)
University of Ottawa: The Comma
The University of Ottawa's Writing Center developed this site. The major sections of the site are "Comma Usage" and "Superfluous Commas." Right and wrong examples are included, along with links for definitions.
Sophia Learning
Sophia: Dashes and Hyphens: Lesson 1
This lesson introduces hyphens and dashes. It explains the hyphen, en dash, em dash, and dash and the uses of each. It is 1 of 4 in the series titled "Dashes and Hyphens." L.11-12.2a Hyphens