3.9 - Learn keyboard shortcuts, ditch the mouse

Keyboard shortcuts are a meaningful productivity edge. Over the course of a week, the seconds you save on each common action add up to hours. The investment is small (a few hours of deliberate practice); the payoff is permanent.

A related move: ditch the mouse where possible. A good trackpad (especially the modern large ones on Apple or some other laptops) is faster than a mouse once you're proficient with gestures. The combination of keyboard shortcuts and trackpad gestures lets you operate a computer at a pace that mouse-and-menu users can't match.