Shortcuts are hot keys on your keyboard that allows you to accomplish a task faster.
You may already be familiar with shortcuts. If you are typing using word processing software, most likely you have used these two combinations of keys:
CONTROL + C to Copy
CONTROL + V to Paste.
In digital art, you can also use a key or combination of keys to tell the software what to do, without having to access the settings or properties tabs of the interface.
In this booklet, which you can download for free, I have listed the most used shortcuts in Krita.
I really hope this will help you. Enjoy.