Whether you're a die-hard hoops head, a casual or someone who's never watched a college basketball game, there's a decent chance you've been invited to fill out a bracket. Here's what you need to know.

NCAA Tournament bracket picks will feature a No. 16 seed knocking off a No. 1 seed, but two of the last six editions of March Madness have featured the ultimate bracket-busting mayhem of a No. 1 seed going down in the opening round.