Creative Commons licenses are the most popular form of licensing for OER because they’re easy to create and understand. Use the Chooser Tool on the Creative Commons website to specify the conditions you’d like to share your work under and get a license you can copy and paste into your document or embed in your web resource.
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CC license compatibility helps you understand how to license your work when you’ve built on other openly licensed work. Open Licenses Step by Step walks you through using the license Chooser Tool. Openly Licensing Your Work tells you more about why you might (or might not) want to apply an open license and helps you think through the conditions.
This answer is from Open Oregon Educational Resources, and is licensed under a Creative Commons Attribution International License (CC-BY) 4.0.