Paradox weekend on Steam

[Tamas]

I think the biggest thing to keep in mind as a CK2 noob, is that this is a people management game. It ain't that hard to advance the economic side of things, hell, it is pretty easy. But your realm is built, maintained, and lost on personal relations and manipulating the feudal system.
Be VERY mindful of de jure borders within your realm if you are a King. Dukes like their duchy nice, complete, and de jure.