There is a wide breadth of open educational resources available; however, you still want to make sure that you are finding high-quality resources that are made available using best practices in Open Education.
When evaluating an open resources, you should be looking for:
An OER that has been peer reviewed
A fully accessible resource that is made widely available in accessible formats
An OER that has been maintained and updated
An OER that includes clear instructions for use, including:
Has the OER been licensed using a creative commons license