Learn to play the game!
Go, also called baduk, weiqi, and igo, is the oldest board game still played. Its name means "the surrounding game" and points right to the heart of the game. Your goal is to surround just a tiny bit more of the board than your opponent, and you'll likely surround some of each other's stones (game pieces) along the way.
It's a game known for its simplicity, beauty, richness and depth. We finally took down the go board at my office because people kept mistaking it for an art piece and fiddling with the stones (although why you would fiddle with something you thought to be art is also a mystery).
I'm not gonna lie, learning to play like a pro isn't going to happen in a weekend. But learning how to play with your friends absolutely can.
Here's a list of online tutorials and related helpful pages:
Hactar Go Lite (android) introduces some basics.