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Fine-tune volume and brightness in macOS

When you use the volume controls on a Mac to increase or decrease the sound coming from your speakers, those levels increment in whole steps on a scale from one to ten, press the up volume button once, for example, and the volume goes up one step out of ten. However…

If you hold down Shift and Option (Alt) before pressing the volume keys on your keyboard, you could adjust the volume in quarter-steps instead of whole ones. In addition to using this Shift and Option (Alt) combination to control the volume more finely, you can also use it when you adjust the brightness on your Mac. Press Shift and Option (Alt), then press one of the brightness keys on a Mac keyboard, and you'll notice that the brightness changes in quarter-steps. This is nice if you find your display is just a bit too bright or too dim.