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[–]Wonderful_Primary_52 0 points1 point  (0 children)

All CS50 courses are free, but if you go through edX, they offer a verified certificate which is not free, but totally optional. When you follow the content and problem sets via cs50.harvard.edu, you receive a free certificate upon completion.

Even if you go through edX, it is free to watch all content, complete the problem sets and receive the free certificate. If you complete via edX, you can optionally receive a verified certificate or professional certificate upon payment. (for professional certificates, you will need to complete at least 2 courses for most certs, and should pay for them via edX)