Anyone who has a Mac is pretty used to using the key along the top of the keyboard to perform tasks. For example the F1 & F2 keys to alter the screen brightness and F10 & F11 to change the volume, but can you change these levels more finely?
Well you can,
Press ALT+SHIFT together with either F1, F2,F10 or F11 to adjust the volume or brightness more finely.
You will notice that the blocks which indicate the brightness or volume increase and decrease more finely. Here’s a screenshot to show this. Notice how only half a block is filled?