Is it a certificate or something like that for the courses ??
From the OCW, no. From the version on edX, yes. OCW gives you the ability to go at your own pace. So it is a trade off.
Yep, edX version has the same material but it is graded. It is great (it is free), but it demands a lot of time
Yah, and for people that have lest time to invest per week, this version has no time limit. That also means you need to self modivate better!
Though it also means that a person that really gets the stuff can move through it quicker...
I don't know any person learning to program that find MIT intro to computer science easy. Most of the people I know took at least 8 hours a week.
Some people that already know the math and some CS find it to be very quick.
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