In French, just like in English, to make most nouns plural, you simply add -s at the end.
Learn how to make a noun plural in French
Note that you don't pronounce the plural -s in French.
If a noun already ends in -s or -x or -z in the singular form, then it remains unchanged in the plural form.
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Examples and resources
"Les pluriel des noms" by youlearnfrench.blogspot.com
"Plurals in French" by www.frenchspanishonline.com