The internet has many useful free R resources, so this will not be an exhaustive list, but these are resources that we know of and believe are high quality. Note that for introductory units (like STAT100 and QMER100) you should not need to explore resources on the internet unless you are particularly confident and interesting – everything you need for these units is covered in the unit material in workshops/practicals.
R programming for Data Science: This free online book covers many standard programming concepts as they are applied in R, and most sections have accompanying youtube videos.
R for Data Science: This free online book teaches you to analyse data using the tidyverse tools in R, it is particularly useful for people who want to develop skills in data wrangling and advanced data visualisation.
R Markdown the definitive guide: This free online book gives an extremely detailed description of R Markdown and its useful for creating a range of document types, including documents, presentations, books and websites.