rnorm() - used to generate random normal deviates) you can type `?rnorm' at the S or R prompt to display a (man page)-style help menu detailing the correct usage of that command, as well as similar commands in some cases. This is a quick and easy method for re-acquainting yourself with familiar commands. If, on the other hand, you do not know the name of a command, it may be preferrable to start the help menu. You may type `help.start()' at the S or R prompt to start a help menu, from which you can search by keywords. This is desirable because it will remain readable when you enter back into the S or R session.
If the help system does not suffice for your particular problem, you might want to try searching the web for answers, www.google.com. There are countless websites devoted to the basics of S and R. It is quite likely that your particular question has been asked and the solution might lie on one of these pages. In addition, there are listservs devoted to S and R programming. Searching the archived messages for answers is an invaluable resource for tips and tricks for programming in these languages. Note that it is good ettiquete to search these lists before posting a message to a listserv...remember, your question may have been previously posted.
Under the documentation section of the R-CRAN website (cran.r-project.org), there are several documents available for programming in R. Some of which were written by the designers of the software (given under the Manual section) while others were written by experienced users of the software (under Contributed).