As with any resource you're using for teaching or research, you'll need to make sure the OER you've found is suitable for your purposes. The BCcampus Open Textbook Collection and some other major open textbook collections offer quality assurance and peer reviews, so you're starting off on the right foot when you use these resources. However, it's still important to do your due diligence to assess the resource's value for your particular course need.
Key aspects to consider when evaluating an open educational resource include:
There are many resources out there to help you evaluate OER, from basic checklists to fully developed rubrics. Here are a couple of resources we recommend:
Rubrics for Evaluating Open Education Objects by Achieve.org