Start with the topic guide.
Vectors, data types, lists, data frames, factors, functions, control flow, packages and CRAN, the tidyverse, data wrangling with dplyr, plotting with ggplot2, reading and writing data, and R Markdown.
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Concept scope
R Language Fundamentals: 13 short lessons, one for each concept. Vectors, data types, lists, data frames, factors, functions, control flow, packages and CRAN, the tidyverse, data wrangling with dplyr, plotting with ggplot2, reading and writing data, and R Markdown.