Creative Commons

Horner, C. Unsplash.com
Creative commons licenses are central to the use of open educational resources. They tell you what you can and cannot do regarding material.
While searching through OER and OA materials, keep in mind that there are different types of Creative Commons Licenses. Some will give you access to reuse and modify materials as you see fit and other licenses may not.

https://www.connectsafely.org/copyright/
Learn More About Creative Commons Licenses
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Creative Commons provides a great read about understanding what the licenses do and about the different types.
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CC: Best Practices for Attribution
You can use CC-licensed materials as long as you follow the license conditions. One condition of all CC licenses is attribution. here are some good examples of attribution. -
CC: Guide to Using Public Domain Tools
Public domain works are valuable because anyone can freely build upon, enhance, and reuse them for any purpose without restriction under copyright or database law.