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Most Mac users never take the time to customize their login screen.
One of the most powerful tools in Preview is the Smart Lasso.
You should be very careful when installing apps on your Mac and try to stick only to the Mac App Store or sites you fully trust.
iCloud email allows you to freely add some text to your regular email address to create unqiue addresses that you can use on an as-needed basis.
If you want to trim some video from the beginning or end of a movie file, you don't need to use a video editing app.
If you use the Find function in the Finder you can perform file searches that are much more complex than using Spotlight.
A new feature in macOS Catalina will be the ability to share entire folders in iCloud Drive with others.
Many Mac users ignore the Go menu in the Finder, but there are some useful shortcuts there.
With standard Mac apps like Pages, Numbers and Keynote, you can revert to a previously saved version of the file to retrieve text or items you may have deleted or changed.
One of the biggest changes that will come with macOS Catalina is the replacement of the iTunes app.