The most essential tool I recommend to any new Mac(book) owner is BetterTouchTool. It started out as a tool to allow you to assign and define new gestures on your trackpad, but has become a lot more since. One of the things it does is window management – drag a window to an edge to full/half/quarter-screen it. You can also assign a keyboard shortcut or trackpad gesture to do this, if you prefer. I couldn't use my macbook without it.