I would advise usual MOOC’s: coursera, edx or udacity.
coursera has long tradition while udacity is more work-oriented. edx is more like a complement.
What I didn’t like was the lack of good interactions with other students in any of them. Nowadayes coursera has lost popularity and despite of having excellent courses, they are sometimes deserted, a lot of people quitting even before starting the more advanced parts.
However, the quality could be beyond expectations for some of them.
I would suggest you to start any of those courses and if you have questions about concepts, try to ask here?
The other platform is Kaggle: they are starting to explore the development of courses in topics related to Data Science. I would advice them A LOT as they have a platform more in tune with Big Data (no many courses will have that).
Not a disclaimer, only to let you know that they are using fCC data for some of those courses 
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