Recently, I have done almost as much learning about fishing than actual fishing. Several books, that you can buy at Barnes And Noble. Anyone of these many fine books will do.
But first, the author of most of these book is Dick Sterneberg.
Search BarnesandNoble.com for Fishing
Hook Line & Sinker
Art of Freshwater Fishing
Fishing Tips & Tricks
Advanced Bass Fishing
Fishing with Live Bait
Fishing Rivers & Streams
Northern Pike & Muskie
Freshwater Gamefish of NA
Advanced Freshwater Fishing Strategies
Sorry if a lot of this looks messy, I'll get around to cleaning it up.