MITx on edX has proper certificates you pay for, with deadlines like a school term. OpenCourseWare is free and open, like borrowing a book from the library—no certificate, no pressure. If my teen is serious about a subject, I would save for the MITx course; the structure has value, like the frame on our loom that keeps the weaving tight. But if they just want to learn, the free one is a blessing, like the monsoon rain that fills our tank when money for the bills is low.
#exams#study
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