"Managing gigabytes" is one of the standard introductory textbooks. It's quite dated now (published 1994, before Google was started, and hence why it says "gig

"Managing gigabytes" is one of the standard introductory textbooks. It's quite dated now (published 1994, before Google was started, and hence why it says "gigabytes" rather than "exabytes"), but a lot of the fundamental concepts are the same. At least it'll give you a vocabulary and conceptual framework for thinking about search.