GIMP is a fantastic artist's tool for editing digital images, especially with the bevy of impressive features in the recent release of version 2.10. Of course, like all creative applications, you can get working more quickly if you can make yourself familiar with the various keyboard shortcuts and hotkeys available. GIMP, of course, gives you the ability to customize these shortcuts to match what you're personally comfortable with. However, the default shortcuts that GIMP ships with are impressive and generally easy to get used to.
This cheat sheet is not an exhaustive list of all of the defaults GIMP has available. Instead, it covers the most frequently used shortcuts so you can get to work as fast as possible. Plus, there should be a few in here that make you aware of a few features that maybe you weren't aware of.