Do you want to improve your R skills Here are my favorite R language resources for users at any level.Learn R language basicsAsk questionsVisualize your dataAdvance your skillsKeep up with new developmentsPackage and repo infoShiny Web frameworkLearn R language basicsIf you're just starting out with R, I (not surprisingly) recommend my Computerworld Beginner's Guide to R.
It's also available as a handy Beginner's R Guide PDF download.