Change Mac Window Size from Any Edge or Corner

Those who have used Macs for years know that you can resize nearly any window by dragging its bottom right corner—through Mac OS X 10.6 Snow Leopard, there was even a resize handle in that spot. But did you know that, starting in 10.7 Lion, Apple made it possible to resize a window from any edge? So if you haven’t updated your habits, try moving the pointer to the edge of a window in the frontmost app, which causes the pointer to change to a double-headed arrow. Click and drag to make the window larger or smaller in either direction. Resizing from any corner works as well; click there, and you can drag to resize the window in two directions at once.