You do not need to cite common knowledge.
Widely-known, generally-accepted information that is not attributable to one source.
Examples:
What is considered common knowledge can be tricky. When in doubt, ask your professor!
1. Delkic, Melina. "Indigenous Peoples Day, Explained." New York Times, October 9, 2022, https://www.nytimes.com/article/indigenous-peoples-day.html.
In most citation styles, two parts are needed: