Time to get organized with a password management app. More than a safe place to store passwords, 1Password makes up new passwords, has secure notes, and more.
Your Mac will always have the correct date and time, through power outages, Daylight Saving time, whatever-- if you choose the right options in the Date & Time preference pane.
The Mac's Spotlight system can help you find just about anything on your Mac. Make it easier to use by triggering it with a shortcut.
The Mac's Mail app opens smaller folders faster than fuller ones. Speed up your Inbox by moving old mail to other mailboxes. Makes a big difference.
If Mail seems stuck, try going to the Window menu and choosing "Activity" and also "Connection Doctor." You'll learn a lot there.
Increase the number of "Recent Items" that your Mac tracks. It's as easy as 1-2-3. Set it once and forget it.
Quickly go to the Desktop folder with Command-Shift-D. It's fast, and it works both in Finder windows and in Open... and Save... dialog boxes.
You can do centered, left justified, right justified, and fully justified, all from the keyboard, in Microsoft Word on a Mac.
Command-W does what a click on the red button does. Command-Option-W does what an Option-click on the red button does-- close all windows for that app.