Learn chess
A free library for every stage: how the pieces move, the mates you must know, the tactics that win games, the endgames that save them — explained with boards, and checked by the engine.
Now play it for real
Reading about chess helps; playing it is how it sticks. Kliwe is free: play in your browser, get every game read back to you move by move by the engine, and talk it over with the community.