These 4 fantastic sites offer more than 17,000 free online courses
Briefly

Coursera provides access to over 5,000 free courses developed through partnerships with more than 300 universities and companies, making it one of the largest resources available.
edX, originally created by Harvard and MIT, offers more than 4,000 courses, allowing learners to audit approximately 1,000 of them for free, further enhancing educational access.
Read at Fast Company
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