First, if you have reproduced content for which you do not own the copyright or used content for which the license does not allow the use you wish to make, be sure to ask permission from the copyright holder. Then, if your course material combines contents under different licenses, here are some basic principles to keep in mind:
CC TV Dinner by Nate Angell is licensed under CC BY 4.0, and is a derivative of tv dinner 1 by adrigu used under CC BY 2.0, and various Creative Commons license buttons by Creative Commons used under CC BY 4.0.
A collection is a selection of existing materials still distinguishable once brought together (e.g. TV dinner).
With collections, existing content does not acquire a new license or copyright. There could be a new copyright or license on the addition of new content only (e.g. introduction, conclusion, commentary, cover).
CC Smoothie by Nate Angell is licensed under CC BY 4.0, and is a derivative of Strawberry Smoothie On Glass Jar by Element5 Digital under a Pexels License, and various Creative Commons licence buttons by Creative Commons used under CC BY 4.0.
An adaptation is a combination of existing materials that are not easily distinguishable once combined (e.g. smoothie).
To acquire a new licence or copyright, the new creation based on existing content needs to be original enough (i.e. involve skills, effort or judgement on the part of the creator of the adaptation). The new creation will then take the most restrictive license from the contents that were combined. The CC License Chooser can help you decide on the appropriate license.
Where you add your chosen open license depends on the platform hosting the material and its format. For example:
Assess your understanding of applying open licenses by completing this H5P.