ALL statistical functions known to date are supported in R. Some we need almost everytime, some we will perhaps never need in a lifetime. You can easily customize which functions you need. You can and should take help of numerous in built and contributed packages that are part of R. You can learn about them in the R website and in the documentation and various other tutorials. This introductory lecture cannot discuss all of them. The R base and stats package are good and powerful enough for doing most routine statistical work and drawing graphs. Type packages() at the R session to learn about the packages installed in your R.