A note about sabermetrics:
BABIP: Batting average on balls in play - a luck factor
GB%: Ground ball rate - a skill factor for pitchers, as well as hitters. The lower the GB% for a hitter the more likely he's making good contact, the higher for pitchers the harder it is to make solid contact off of him.
K/9: A simple one, strikeouts per 9 innings pitched.
BB/9: Ditto but with walks.
I always found it helpful to have this glossary around. I tend to use the terms like I'm talking to people who know exactly what they mean. That's not necessarily a good thing so you can always refer back to this post in times of pure 'saber-speak'.