The 15 best free or affordable online computer science courses, including options from Harvard, MIT, and Stanford

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Online learning platforms edX and Coursera both offer many computer science courses that are free to audit or try with a free trial. You can also pay for certificates of completion.
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Coursera and edX offer online computer science classes from top universities and companies.Below, you can find 15 affordable or free online computer science courses.
Some of them offer paid