When instructors ask for peer-reviewed literature, they are asking you to look for journal articles that have gone through a rigorous review process - you can see that process here: https://libguides.brenau.edu/c.php?g=684088&p=7396223
When you search in the databases, there is an option on the left side of the screen that allows you to select for peer-reviewed articles only:
I suggest using this LibGuide to help you in your search: https://libguides.brenau.edu/education