This tutorial is intended to introduce users quickly to the basics of R, focusing on a few common tasks that biologists need to perform some basic analysis: load a table, plot some graphs, and perform some basic statistics. More extensive tutorials can be found on the project website and via bioconductor (not covered here).
You can add more tutorial links in comments if found new pages.
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R for epigenetics http://www.bristol.ac.uk/caite/geocode/newcastleshortcourse/bioinformaticstoolsforepigen.pdf
Genes and genome with R https://www.ebi.ac.uk/training/sites/ebi.ac.uk.training/files/materials/2013/131021_HTS/genesandgenomes.pdf
Welcome to a Little Book of R for Bioinformatics http://a-little-book-of-r-for-bioinformatics.readthedocs.org/en/latest/
Reading Genomics Data into R/Bioconductor http://bcb.dfci.harvard.edu/~aedin/courses/Bioconductor/3.ReadWrite.pdf
Create the R package https://cran.r-project.org/doc/contrib/Leisch-CreatingPackages.pdf
R package development https://www.rstudio.com/products/rpackages/devtools/
There are many othe useful turoial on R package creation, such as
http://www.r-bloggers.com/creating-an-r-package-in-windows/
http://hilaryparker.com/2014/04/29/writing-an-r-package-from-scratch/
http://www.r-bloggers.com/how-to-create-an-r-package-in-windows/
Useful R resource http://ucanalytics.com/blogs/r-vs-python-comparison-and-awsome-books-free-pdfs-to-learn-them/
Learn R by urself www.datasciencecentral.com/profiles/blogs/learning-r-in-seven-simple-steps
R tutorial for bioinformatician http://www.introductoryr.co.uk/R_Resources_for_Beginners.html
A Compendium of Clean Graphs in R http://shinyapps.org/apps/RGraphCompendium/index.php
Colour in R http://www.stat.columbia.edu/~tzheng/files/Rcolor.pdf
R graphics https://bioconductor.org/packages/devel/bioc/vignettes/chromPlot/inst/doc/chromPlot.pdf #chromPlot