Mixed in are courses that are not free, and have a cost, so be sure to double check when signing up, or you can filter to only look at the free courses.
There are plenty of high quality courses available through Harvard University, approximately 140 in a recent count. Some are quite specific, and not quite what would qualify as a standard university class, such as “Nonprofit Financial Stewardship Webinar: Introduction to Accounting and Financial Statements” that would target only a select group with interest in this area. Mixed in are courses that are not free, and have a cost, so be sure to double check when signing up, or you can filter to only look at the free courses.