Here’s an old favorite. How to set a screen saver on your Mac.
To set a screen saver start by clicking the Apple in the top left of the screen (the Apple Menu). Choose System Preferences. From the window that opens click “Desktop & Screen Saver.”
Next click the tab labeled “Screen Saver.” The other tab is for setting a desktop picture. I’ll get to that another day.
Learn how easy it is to change the desktop background picture or screen saver on your Mac.