how add brush costum? also can you make your own brus?
Hello @kerjasonoey and welcome to the forum!
Brushes can be added via Krita’s resource management. To import single or loose unbundled resources into Krita, you open the menu Settings → Manage Resources... where you have to click on Import Resources, in the opening dialog you have to browse to and select the resource you want to import, click on the OK-Button, now Krita imports your brush, for example.
To customize brushes, you have to open the Brush Editor via its Toolbar icon or via the shortcut F5. The thing is, that you have to learn a lot to confidently manipulate or create brushes, that is because Krita is so complex, it has alone more than 15 brush engines. Therefore, I recommend you the currently best tutorial you can get:
Michelist
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If you just tweak an existing brush with the Brush Editor, you can chose to overwrite the original brush, which will keep your changes for whenever you use the brush.
I only do that when I change the spacing of a brush tip because the original is drawing spots rather than strokes.
As a user turned to brush creation, I would recommend trying out various brushes, both the default or other custom brush sets. Many of these are great and free of charge. Check out Ramon Miranda, Rakurri, David Revoy or Memileo brushes for instance, or the packs I created (find them on these forums). Try out these brushes to see how they behave, find ones you like and study their settings. If you find a brush with character you like, use it as a baseline to modify, tweak the settings and see what they do. You can always look for descriptions of the various settings in the Krita docs.
And yes, there are many brush engines in Krita, but the most functional and useful brushes are the Pixel and Color Smudge engines. Most other engines are more niche or specialist, so concentrate on these other two to keep it a bit less overwhelming.