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It is basically peer tutoring.
am new here so i wan now how i can get started with course i can not find the lesson
The edX content is on the edX site. If you wait for one of their classes, you have access to their discussions, etc. But off you just want to go through one of the old ones, you can post questions here.
This sub section was made a couple years ago when all the edX stuff was pretty new.
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I know this is a late response, but the cs50 on edx right now is actually from the current semester that is about to conclude. Work can be done and submitted for this class via edx until 12/31/14 and you can even get a certificate for completion. As much as I enjoyed 6.00, I'm even loving cs50 that much more as there are a LOT of resources for it and a very active community that spans reddit, facebook, twitter, etc.