I use R software for a lot of my complex data analyses and have written up a few web pages about various things you can do with R. It turns out that R has a Wiki site, R Wiki
A Wiki is a website that is easily edited by anyone with an interest in the topic. The main page explains that the purpose of the R Wiki is “the collaborative writing of R documentation.” The site also warns that you should check the primary documentation for R first, such as the official manuals and the FAQs.
You can find an earlier version of this page on my old website.