The free Chess Mentor lessons include opening courses that do a nice job of explaining opening principles and tieing them into a very gentle introduction to theory. That's a good place to start. You might like Chess King's Guide to Opening Ideas, a 3 dvd video series where Steve Lopes takes you on a breezy whirlwind tour of all the major openings. Fundamental Chess Openings by Paul van der Sterren is the current gold standard for one volume opening enyclopedias. He does a nice job of explaining why certain lines have evolved and their major ideas. It's not dumbed down, but he doesn't usually go deeper than 8 to 12 moves, figuring you'll go check a database or specialized works for more. My $.02 and here's the CM link:
http://www.chess.com/blog/webmaster/free-chess-mentor-courses
I have been playing chess for years, but not in a very strategic way. I know how all the pieces move. I know the main concept is to develop my side of the board and bring out the pieces - but I do so in more of a 'random' way rather than with an actual plan.
I have watched youtube clips on specific openings (english, sicilian, etc) and that gives me the 'moves' to learn, which is needed, but I am hoping to learn the "why" and not just the "how". If anyone could offer me help in explaining the "why" that would be great! Though more of what I was expecting (and my reason for asking) is some site links, some videos or maybe even a book I can get at the library to explain to me how I can better open to improve my game.
thank you