Brushes in Procreate are one of the most important tools of the program, solving completely different tasks: lettering, shading, background filling, stylization. It is worth noting that the application has more than 180 built-in brushes, which can also be transformed into feathering and an eraser. And this, in turn, allows for an even more individual approach to the process of drawing and creating textures on illustration objects.
In addition to the built-in packages, at the moment in Prokrate there is an immense number of sources where you can purchase brushes of eminent illustrators who are puzzled by creating their own packages, or download free ones. I buy brushes on gumroad.com or creativemarket.com, and I have also collected for myself and my subscribers a list of great free options for all occasions.
Each brush has settings, any of which you can change: make it more transparent, change grain, increase the volume, edit the tilt level, or immediately build in a blend mode! Or you can even take a photo of an unusual texture, for example, moss or tree bark, and create a brush yourself using the import / export buttons in the settings! This is more difficult than it seems at first glance, because all settings are specific, and besides practice and experiment, you will need to read a lot of information, which is mainly in English!