The first is a good book of tactics. The next will be some basic openings book that's a good introduction to openings, then a book about strategy, positional play, a couple of pages about basic endgames (no such "book" out but some web pages may be out there) then a good middle endgame book (between the opening and the endgame, the latter part of the middle game). Amazon is a good place to find the best books.
Finally one gets specific openings books or DVDs about the systems one wants to play (the books will do also but if they don't have DVDs too that include the variations too then it's extra effort to put them on the board, and if they have those then it would be as good as just a DVD).
A chessbase interface with a chess engine like Fritz (
http://www.chessbase.com/shop/ though one can buy it from anywhere)(that also has a reasonable openings book - the fritz book - included so one can study openings, though a bigger one completely worked is better when one is more experienced - it's months [full time] of work to make it good and can't be recommended until one gets really serious. Freechess.org (FICS) is free (like the Winboard and Arena interfaces and engines to them, both that one can use at Freechess.org too) but one gets to play with the chessbase interface too at Playchess.com and it's the best if one is any serious, though there's also the Internet Chess Club (ICC) that one can try (up to two or even several times in the long run) for free.
- one chess newsgroup: rec.games.chess.misc
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www.youtube.com for some videos.