Learn R, in R.
swirl is a software package for the R programming language that turns the R console into an interactive learning environment. Users receive immediate feedback as they are guided through self-paced lessons in data science and R programming. I think I first came across swirl in mid-2014, while working through the early stages of the Data Science Specialization on Coursera, put together by Johns Hopkins University professors Roger Peng, Brian Caffo and Jeff Leek. [Read More]