The free & open source software package R is increasing is popularity because of its power & flexibility. For anyone new to statistics & data science, unless you have a programming background R will likely have a steep learning curve. There are literally hundreds of websites devoted to this subject, so making sense of the literature available on R can be at least as daunting as the software itself.
Created by a novice data scientist, this website was born from the frustration of trying to learn R through dozens of web based tutorials. Included here are websites considered helpful or informative. This R directory is not intended to include every available site on the subject, only those that have proven useful or are visited frequently.
However brief, this site does include links in a variety of categories, from instruction & tutorials to reference & troubleshooting help.
Hopefully this list will be helpful for you as well.