You can easily have your Mac read selected text out loud. You can select the voice and speed. With some more work you can add a keyboard shortcut or have it export the audio into a file to use later.
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You can create folders just to use in the Dock that contain aliases to apps or commonly-used files.
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I get complaints from time-to-time about the audio quality in my videos. I try my best, but I also remember the saying "perfect is the enemy of good." So I try to not obsess over audio issues and focus on the tutorial information at all times.

Your Mac comes with a built-in Dictionary app that also includes a thesaurus. You can also access it while writing, or on the iPhone and iPad while writing though not in an app.
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A common question is whether you can use your old iMac as a display for a new Mac mini, Mac Studio or maybe a second display for a MacBook. This is called Target Display Mode. Unfortunately, it only works with some older iMacs if you are connecting from older Macs and using specific systems. It probably isn't a good idea anyway as those older iMacs have screens that are not as good as what you can get cheaply today.
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With a simple Shortcut you can record your home IP address and save it to a Note that you can access from anywhere with iCloud. A little more work and it can run hourly to keep up with any changes.

Recent new features in the Mac, iPhone and iPad Photos apps let you find and remove duplicate photos easily.
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