Final answer:
All of the options could be included in the about page: introductory video, class description, syllabus, links to 3rd party sites.
Step-by-step explanation:
You could include all of the options in the about page. An introductory video would be a great way to engage visitors and provide a brief overview of the topic. Class descriptions would give more detailed information about the courses offered. The syllabus would outline the content and expectations for the class. Links to 3rd party sites could be included as additional resources or references.