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I choose Coursera is the best Open Online Learning because its provide certificate which be used in the future and also usable in university.

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Not completely free.
ven though there are still many many free courses on Coursera, most of the high-demand courses are now "audit-only": a mode where non-payers don't have access to graded assessments. This angers many free learners. On the flip side, they provide very generous financial aid.

Quizzes are too lenient.
Quizzes have unlimited trials. Basically, this tempts people to trial and error to get the quiz answer right, instead of working through it properly. Thus, skill validation is quite doubtful.

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Extremely diverse catalog.
You can find more topics in more areas than anywhere else. Besides the high-demand business and computer science courses, they also have many many arts, humanities, psychology, self-developments courses. Don't underestimate them. Many of them are really brilliant and a joy to take. I took Social Psychology and a few history courses from them besides the bunch of tech courses I take from them. Absolutely amazing!

Very easy to use forums.
discussions are quite active. The forum is one of the best feature of their platform. It beats edX by a landslide in this respect.

Peer review system.
Their peer reviewed assignment is more extensive, and easier to use than edX, allowing them to have more projects as part of the courses.

Strong identity verification mechanism.
The webcam photo ID verification + the typing pattern is quite strong. I personally tested to break it. It was quite amazing how the typing pattern can indeed verify my identity.

They can monetize.
Being a for-profit, they can monetize, and hence, have more potential of expanding and offering more courses.

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> universities and other organizations to offer online courses, specializations, and degrees in a variety of subjects

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> As of Q1 2017, users can still "access course materials for free > some courses have the option to pay a fee to join the "Signature Track".

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> A venture-backed, education-focused technology company.
> Founded by Stanford professors Andrew Ng and Daphne Koller that offers online courses
> Based in Mountain View, CA.