The course is designed for adult style learning. If you are teaching, this means you are looking for material related to your job--your curriculum and students. The links add many voices from a variety of sources. They give you choices among a lot of resources. As you go through these, your interests and teaching situation should provide the best guidance.
In effect, you are creating your own text of reprinted web articles and units. By highlighting (underlining) and annotating (writing brief commentary in selected marginal points) you indicate something of the value you found in the article or resource. Your final Table of Contents also reflects this personal valuing and selection.
A file folder or notebook of highlighted, annotated reprints and written answers to course posed questions will be the material you submit when ready to complete the credit portion of this experience.
Hopefully you will find this on-line course a resource you will want to return to and continue using as you teach. This is another reason to use the course to reviw and highlight material that interests you and fits your teaching situation, even if your present time and situation do not allow depth in all areas.