Open Educational Resources (OER) are free digital learning materials that may be reused and/or customized. They often use Creative Commons licensing, so you can tell upfront what permissions are available for copying and sharing. Examples of OER may include textbooks, lesson plans, learning modules, lecture notes and slides, syllabi, assignments, podcasts, images, videos, and training materials.
Details on OER are too extensive for just one page in this guide, so please go to this the separate, detailed guide created for SDCC: Open Educational Resources