Beginner
Learn the structure of an R solution, and the core of the R programming language.
Building Your First R Analytics Solution (Charlotte Wickham, 2020)
Programming with R (Mihaela Danci, 2020)
Intermediate
Debug your R programs, and customize their running environment.
Creating and Debugging R Programs (Christopher Venturini, 2020)
Customizing R Environments (Emilee McWilliams, 2020)
Advanced
Build tables and capture reusable logic with R functions.
Building Tables with R (Emilee McWilliams, 2020)
Applying Functions in R (Chase DeHan, 2020)