https://www.coursera.org/learn/machine-learning
https://www.udacity.com/course/intro-to-data-analysis--ud170
https://www.udacity.com/course/intro-to-machine-learning--ud120
https://www.udacity.com/course/intro-to-descriptive-statistics--ud827
https://www.udacity.com/course/intro-to-inferential-statistics--ud201
https://www.udacity.com/course/intro-to-statistics--st101
https://www.udacity.com/course/intro-to-data-science--ud359
https://www.udacity.com/course/machine-learning-unsupervised-learning--ud741
https://www.udacity.com/course/machine-learning--ud262
and Anything related to data science mathematics available on the internet.