Even if you already know this tip, you may not have realized all the places where it works. When you find yourself in a list, as in a Finder window, an Open dialog, or a set of autocomplete options, you can usually press keys on the keyboard to navigate within the list. Press M, and you’ll drop down to the first item whose initial letter is M. If multiple items start with M, use the Up and Down arrow keys to move more precisely, one item at a time. And rather than clicking an Open or OK button, try pressing Return to activate the item. So if you assumed you had to use the pointer to scroll through lists and click list items, try the keyboard—it’s faster to type W than to scroll all the way down to WY in a list of states.