I'm generally happy with the O'Reilly books I've bought. What they cover depends on the book. Some, particularly some of the language or OS books, are referenc

I'm generally happy with the O'Reilly books I've bought. What they cover depends on the book. Some, particularly some of the language or OS books, are reference-oriented. Not the kind of thing you'd necessarily read straight through. Some, the "intro" books, are just what that sounds like. Enough material to get started. I don't know if I have any O'Reilly books I'd consider "deep", exactly, but I don't think they really aim at that. In general, my experience is the books are what the titles say they are.