Despite expressions of a lot of mimetic discontent online about how bad K&R is, the second edition (1988) remains an excellent example of technical writing. It's a good intro to (ANSI) C. It's not a good guide to e.g. build systems or other industry-standard tools, for the reasons described at the beginning of this article—but then again it doesn't pretend to be. (The name of the book is "The C Programming Language", after all.)