Data Science Thinking
- https://medium.com/@d_spiegel [Articles]
R programming
- https://rweekly.org/
- http://r4ds.had.co.nz/ [Free online Book]
Python programming
- https://jakevdp.github.io/PythonDataScienceHandbook/ [Free online Book]
Other
- https://www.datascienceatthecommandline.com/ [Free online Book]