Double-clicking is so 20th century. While I sometimes double-click a file to open it, I often use a nifty keyboard shortcut to do the same thing. Select a file and press Command-down-arrow and the file will open with its default application. This is most practical when youre navigating in a folder using the arrow keys to move around. (You can also press Command-O to do the same thing.)
7. Tab in either direction through the Application Switcher
Most people know the Command-Tab shortcut. This displays OS Xs Application Switcher above all your windows. Here youll see the icons of all currently open programs. When you keep holding down the Command key, each time you press Tab, the selection moves to the rightlet go of the keys to jumping that program.
Sometimes, though, I accidentally miss the program I want, and need to come back. Instead of pressing Tab to go all the way around, I press the Shift key, then press Tab to cycle through the list in the opposite direction. (So you press Command-Tab, keep Command held down, then add Shift, which results in your pressing Command-Shift-Tab.)
8. Select whole words more quickly
When I revise texts that Ive written, I often select text, copy it, and paste it in a different location. Theres a nifty shortcut that makes this easier when you want to select complete words. Place your cursor at the end of a word, then press the Shift and Option keys. Press the left arrow key to select to the end of the word to the left, or the right arrow key to select to the end of the word to the right. This shortcut also treats punctuation as words, so a press of an arrow key, say, at the end of a sentence will select the final period.
9. Hop through Safaris tabs
When I use Safari, I use multiple tabs, rather than windows. Sometimes I have a dozen tabs open at once, and I need to switch from one to another. Whats the best way? Using the keyboard, of course. Just press Command-Shift-right arrow to move one tab to the right, and Command-Shift-left arrow to move to the left.
10. Put your Mac to sleep
Finally, the shortcut I use at the end of most days is the one that puts my Mac to sleep. Press Command-Option-Eject to do this. If your keyboard doesnt have an Eject buttonsuch as on a laptop without an optical driveits Command-Option-power button.