Apologies.
Openstax seems to be a platform for sharing any educational materials like books, lessons, etc as opposed to Massive Open Online Courses which is philosophically classroom based I.e. material formatted in incremental lessons.
Openstax seems to be legit open platform (presumption =100%) and I’d like to double check that presumption with community here.
Hope that clarifies my request?
Edit: reread 1st toot and realized link was missing 🤦🏾♀️.