Learn R

Style Guides

• Google's R Style Guide
• Tidyverse Style Guide by Hadley Wickham
• R Style Guide by Jef Works
• Doing R with Style (pdf Chapter) from OnePageR

Writing Better Code

• Writing Better R Code pdf (Bioconductor)  -- Tips for functions, performance, testing, parallelsation, and debuggin.
• Writing Good R Code and Writing Well (Joseph Rickert) -- LInks to several other guides and tips for coding and writing

See also R Markdown to combine code with commentary. Go straight to the list of articles. 

• R Markdown: The Definitive Guide
  • by Yihui Xie, J. J. Allaire, Garrett Grolemund
• Jupyter And R Markdown: Notebooks With R (Karlijn Williams / Data Camp)
• Advantages of Using R Notebooks for Data Analysis Instead of Jupyter Notebooks (Max Woolf)