• Hi, Steve. Thanks for very interesting post.

    Highly recommended for learning R right to read awesome free ebook: Efficient R programming (by Colin Gillespie, Robin Lovelace)
    Because in my opinion main advantage of R language - its high performance. And this book learn you how to write efficiency , fast and structured R code. Dont spent time for tutorials and simple demo, this book very easy to read and learn. Number one.

    Recommended spend 2 days to learn RStudio (the best free idea for R): https://bookdown.org/chesterismay/rbasics/3-rstudiobasics.html

    Also you maybe will find some useful info in my favorite list R ebooks: https://github.com/ktaranov/AwesomeR#r-books (also awesome list here)
    Nice online courses: https://www.datacamp.com/