Here’s a quick overview of important community resources for A Game of Thrones: the Card Game, Second Edition.
CardgameDB– A little dated in some ways, this is a semi official site owned by FFG/ANA. It features deckbuilders for all of their card games as well as forums and space for various forms of front page content.
Annals Of Castle Black– If you’re looking for information on what was played and what did well at nearly any AGOT event, this is the site for you. There’s a staggering amount of information available.