These are the really helpful links I use a lot
[Data Carpentry] (https://lessons.datacarpentry.org/R-ecology-lesson/01-intro-to-r.html) - this is a good introduction to R
R4DataScience - this is the book by Grolemund and Whickham that is really good
R Companion - this is a great stats site with a lot of well done tests
Stackoverflow - a site that has a lot of good resources
A fun site is BlueSky and use #rstats
Still adding more sites and accepting suggestions