You can preview your Screen Saver choices right there in the System Preferences app. It's much quicker to do it this way.
Preview your Mac screen saver choices
The Mac’s System Preferences has a Search box
Quickly find the proper item in System Preferences, by searching. There's a reason they put that "Search" box up there-- try using it! Great for new Mac users.
Mac trackpad users: try “tap to click”
Save your hands by making it easier to click the trackpad! "Tap to click" takes away the need to press hard, saving your clicking finger. Try it!
Let Apple take care of Daylight Saving Time on your Mac
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.
Use the ⌘-Spacebar shortcut to bring up Spotlight on a Mac
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.
Find more stuff in the Mac’s Recent Items menu
Increase the number of "Recent Items" that your Mac tracks. It's as easy as 1-2-3. Set it once and forget it.
Add text labels to the Mac’s toolbars so you know what the buttons are for
Add text labels to toolbar buttons, making them easier to identify & easier to click on (because they're bigger). Works in Finder, Preview, Mail, and more.
Speed up your typing with Text Substitution on a Mac
Make your own shortcuts for text you type a lot. Boilerplate text, phone numbers, email addresses, website addresses-- these are great candidates.
How to show the day, date, and time in your Mac’s menu bar
Check one little box and improve your Mac experience for every day moving forward. I wonder why Apple didn't set it up this way to begin with.