founded in 2000 is an online chess site.
If you would like to play relaxed, friendly online chess, then...

The Why and How of Chess

The Why and How of Chess
Motivations behind playing chess

Gentle Chess Introduction for Newcomers
Introduction to the Chess Pieces
How the more advanced pieces move
Check and Checkmate Introduction
Castling Introduction
En passant Introduction
How Games are drawn

Correspondence Style Chess
Why Correspondence style Chess