Found in 2 comments on Hacker News
larrydag · 2015-09-09 · Original thread
My favorite intro to R book is The Art of R Programming by Norman Matloff
Hansi · 2013-02-08 · Original thread
I've been working with R 90% of my time over the last two years and I agree it's a freakishly inconsistent language.

Me and the team I work with are still finding out weird completely illogical errors that effect the language but I think I've somehow started loving it despite all it's flaws and I did actually semi-enjoy the process of figuring out all those little wtf issues.

For those starting out with it reading this book + r inferno helps a lot with understanding the underlying weirdness and inconstancies of the language:

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