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For Linux users, it is probably installable through the distribution's package manager.

For others, the R language website: https://www.r-project.org

Also try the IDE from RStudio to make life more pleasant: https://www.rstudio.com

Good luck! It is a fun journey and a big, deep, wonderful, rewarding rabbit hole.

The R for Data Science book really is the best, but I would also recommend https://www.datacamp.com/ for some great video tutorials.

Also check out: R for Data Science: http://r4ds.had.co.nz/

It's got a lot of good intro materials for R. Though having some understanding of another programming language would be pretty helpful.