Then you’ll probably want to watch this playlist on Krita’s brush editor and the art of making brush presets using Krita. Currently, this is the most comprehensive tutorial you can find.
But you can get a lot of brushes in our resource category, and then there are those sources you can not find here, because their creators did not publish or promote them here. In between it was possible for me to collect about 9000 + X brush presets for Krita, since I wouldn’t have found any existing download that is out there, there will be probably (much) more to get, also recreations of brushes are among them, and you will probably find more that are made with PS in mind since I believe there is no app for which you can get more native brushes.
Recreations of PS brushes are at least these bundles:
MB Starter Pack 2021v4 Recreation for Krita * RE-UPDATED! with Michelist quote in og post*
Photoshop common brush transfer, with original brush
This one should also fall in this category, although it is a PS & Procreate recreation 
:
KolorMarc-Inspired Marker Brushes
Michelist