ComputerWorld’s R for Beginners Hands-On Guide by David Smith.
From the post:
Computerworld’s Sharon Machlis has done a great service for the R community — and R especially novices — by creating the on-line Beginner’s Guide to R. You can read our overview of her guide from 2013 here, but it’s been regularly updated since then.
Now available in PDF format!
David also suggests that R beginners check out beginner’s tips for R from the Revolutions archive.
If you are using R, the Revolutions blog is on your browser toolbar. If you are learning R, the Revolutions blog should be on your browser toolbar.