Patterns and Gradients let you create images that go beyond simple colors and let you create more interesting images. And using them also means we begin to see how to combine a variety of tools, like paint tools, selection tools, and brushes, to create the effects we want in our images.

Links:

https://docs.gimp.org/2.8/en/

https://www.ahuka.com/gimp/paint-tools/

http://hackerpublicradio.org/eps.php?id=3150

https://www.ahuka.com/gimp/miscellaneous-tools/

http://hackerpublicradio.org/eps.php?id=3180

https://www.ahuka.com/gimp/patterns-and-gradients/