Practice

Here are some great sites for practicing your chess skills.

Chess Kid

This is a great site with lessons and puzzles:

www.chesskid.com/

Chess Tempo

This is the best website I have found for practicing chess tactics. The site's free registration allows practicing unlimited tactics.

https://chesstempo.com/chess-tactics.html

lichess

This is a growing site with a tremendous amount of resources for every chess player from absolute beginner to seasoned masters. There's something here that every chess player can learn from.

lichess.org/