OER are not yet fully established in the higher education sector. Reasons for this include individual uncertainties regarding legal, technical, or didactic issues. In this workshop, you will learn about the characteristics of Open Educational Resources and reflect on opportunities and challenges that go along with their use. A special emphasis lies on copyright and open licensing. In interactive exercises and with practical examples, you will learn how to integrate OER into your work and what to consider when creating your own OER. In addition, you will get to know the key functions and features of the Lower Saxony OER-portal twillo.