I have Evening's The Lightroom 4 Book Complete Guide for Beginners, and Adobe's LR4 Classroom in a Book. Evening is a bit more practical, Adobe sometimes almost mind-numbingly dense and repetitive, but it is also very informative. While there are some practical demonstrations, i.e. "do this, then change that..." it is more heavy on theory. Evening has plenty of theory, but also plenty of practical information and a companion website, and a somewhat more relaxed, conversational writing style- though Adobe's book isn't overly professorial or dry either. I still use both these books as references, but I also find that youtube offers a comprehensive buffet of lectures, lessons and tutorials for all manner of software including Lightroom. There are a great many come-ons for various pay sites mixed into the tutorial search results, but plenty of good info also. I am also a NAPP member and that gives access to plenty of lessons as well, online and in the monthly mag. These lessons are a bit more direct about specific goals for the adjustments; i.e. " to darken the sky do this" and so on...
If I had to offer only one resource I would probably recommend Evening's book. Otherwise, search youtube for Lightroom.
If I had to offer only one resource I would probably recommend Evening's book. Otherwise, search youtube for Lightroom.
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. Second best lightroom book is adobe's lightroom training videos. Third best lightroom book is youtube! 
