I bought new graphic tablet and installed latest krita. Sadly, when I zoom in just a little bit (e.g. 200%) the pixels of the brush are visible The brushes that I'm using are basic for Krita, I also checked on Sketchbook and they are also visible. The tablet itself has quite good parameters so I doubt it's its fault. Can I change it somehere in the settings? Anybody experienced similar problem?

Since both are raster editors, at some zoom level the pixels will always become visible. That has nothing to do with your tablet, and everything with the size of your image _in pixels_. Too big, and everything will slow down, too small and you'll see the pixels. For sketching, a good rule of thumb is to work at 50% zoom with a canvas that at least fills the Krita window.

This is a good tutorial if you're an absolute beginner: https://www.davidrevoy.com/article185/t ... w-portrait

No, that must be some kind of mistake. I have little experience with digital art, however I will get better quality in Paint, so the software dedicated to digital should perform better. Besides, I've seen a lot of digital art in great quality so there must be a way

Yes, there is a way, and that means you will have to learn to use the tools. Krita is extremely capable, which means you are doing something wrong. So, start with that tutorial.