MOOCS

MOOC platforms :

https://www.coursera.org/

https://www.edx.org/

https://www.datacamp.com/

https://lagunita.stanford.edu

https://www.udacity.com

https://www.futurelearn.com

https://www.udemy.com

http://www.dataschool.io/

http://www.statistics.com/

I did take courses on coursera, edx and udemy and some on udacity. I quite like coursera and edx because most of the courses have a very high standard, are very mature platforms providing good learning support (progress report, certificates, exercises, quizzes). I very much liked the peer review process on Coursera but haven't seen it used anymore recently.
Udemy and also Udacity are both a bit of a surprise box (some courses are great some less so) so check the user reviews.