Astropad, an iPad app that allows you to draw on your Mac at a fraction of the price of a Wacom table, has been updated to be compatible with Apple Pencil and added other stability improvements.
Watch the video below for a good explanation.
If you have apps on your Mac that you want / need to draw on, you can see the app on your iPad via the Astropad app and Mac companion app. Basically, you control your Mac with your stylus via the iPad.
Using the app with a stylus allows for greater precision and control for artistic Mac apps than simply using a track pad or mouse as an input device.