<https://www.madcapsoftware.com/blog/how-to-create-online-learning-content/#webpage>
<http://schema.org/primaryImageOfPage>
<https://www.madcapsoftware.com/blog/how-to-create-online-learning-content/#primaryimage>
<https://www.madcapsoftware.com/blog/how-to-create-online-learning-content/>