- Swirl (a good tutorial to the syntax and basics of the language) - https://swirlstats.com
- Наглядная статистика. Используем R! (A Russian language book on basic statistics and R) - https://cran.r-project.org/doc/contrib/Shipunov-rbook.pdf
- The Art of R Programming (An English language book that covers the basics (and more!) of the R language) - https://nostarch.com/artofr.htm
- R tutorial (An English language video series that covers the basics of the language (although they use a different environment and set of packages)) https://www.youtube.com/watch?v=SWxoJqTqo08&list=PLjgj6kdf_snYBkIsWQYcYtUZiDpam7ygg&index=1
- R Colors Cheat Sheet - http://www.stat.columbia.edu/~tzheng/files/Rcolor.pdf
- Data.Table Cheat Sheet - https://s3.amazonaws.com/assets.datacamp.com/img/blog/data+table+cheat+sheet.pdf