macOS Partial Volume and Brightness
This is a 15 year old trick, but still very useful and very little people use it. When you press the volume or brightness keys macOS increases or decreases the sound coming from the speakers in increments steps, from 1 to 10. So, press the up volume button once, and the volume goes up one step out of ten. Same goes for the brightness setting.
But sometimes you might need a finer tunning of the settings, specially for the volume. You can do that by pressing the
SHIFT while pressing volume or brightness keys.