Currently taking 2 free courses on AI and Machine Learning by Columbia University (which is rated as the number 1 University for Data Science).

You can take them for free here. Completing all 4 (it's a small series) actually counts as 25% of their master's programme!
https://www.edx.org/micromasters/columbiax-artificial-intelligence

If you want some tips on how to learn Data Science or Data Analytics for free then do follow me as I intend to write a series of blogs on it.