There are several good places online to take online classes, and most offer a quite a few courses in multiple disciplines. You can spend a long time perusing the various class catalogs, or you can check out this nicely curated list of online courses from eight top universities.
The courses are divided into 13 categories and were created at eight top US universities: Harvard, Brown Cornell, Princeton, Dartmouth, Yale, Columbia, and the University of Pennsylvania.
Here's a list of the categories, along with how many classes are available in each:
- Humanities (59 courses)
- Computer Science (23 courses)
- Art & Design (19 courses)
- Business (66 courses)
- Health & Medicine (25 courses)
- Social Sciences (54 courses)
- Data Science (21 courses)
- Education & Teaching (17 courses)
- Science (25 courses)
- Engineering (16 courses)
- Mathematics (11 courses)
- Programming (4 courses)
- Personal Development (4 courses)
There are links to all the classes on the page, and all the links go to a site called Class Central. The Class Central site provides a link to enroll in the class.
Class Central would like you to create an account, but you don't have to if you'd rather not.
Whether you create a Class Central account or not, clicking the class link takes you to the site that offers the class. Most courses are offered through Coursera, edX, FutureLearn, Canvas Network, etc. If you don't already have an account at any of those sites you'll be asked to create one, which usually involves providing a name and an email address.
A note on Coursera: Coursera has altered the sign up process to the point that it's not clear that classes have a free and a paid option. The free option allows you to audit the class, the paid option offers a final grade and a Course Certificate.
Enrolling in the free class (auditing) is a little tricky. To audit the class, when you're at the page for the class you want to sign up for, click on the blue Enroll button. When the enrollment window opens, there will be an option to audit the class - either a small link in blue at the bottom of the window that says Audit, or a larger window with the option to purchase the course or audit only. You can choose which option you prefer. If you choose audit, at that point you're enrolled in the class. Paying for the class will take you through the purchase process.
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