next steps: lots of places you can go to keep going

https://www.datacamp.com/
https://www.codeschool.com/courses/try-r
https://www.udemy.com/introduction-to-r/
http://tryr.codeschool.com/
https://ramnathv.github.io/pycon2014-r/learn/README.html
https://www.lynda.com/
https://www.edx.org/course/introduction-r-data-science-microsoft-dat204x