Krita 4.2.9: How to add brushes on Krita.

You can add new brushes on the Krita application using the Main menu - Settings - Manage Resources...

One good option is to use free brushes from KDE website, see this web page.

This will open a new window and use Import Brundles to import the brushes into Krita.

Krita 4.2.9: Another new released Krita.

This new released of Krita 4.2.9 was made on March 26, 2020 comes with new fixed options and .
The full released note for versions 4.2.x can be found at this webpage.
All download versions: Windows Installer 64-bit (106MB)
Windows Installer 32-bit (105MB)
Windows Portable 64-bit (146MB)
Windows Portable 32-bit (145MB)
Mac OSX Installer (186MB)
Linux 64-bit Appimage (198MB)
You can used with these operating systems:
Operating System: Windows 8.1 or Higher, OSX 10.12, Linux
RAM: Recommended 4GB or higher
Optional GPU: OpenGL 3.0 or higher
Graphics Tablet Supported: Wacom, Huion, Yiyinova, Surface Pro
You can find many options to learn to use the Krita software.
The good one is the official youtube channel comes with news, see for example the RGBA brushes how works and is fixed:

News: About the NVIDIA DLSS 2.0

This past week, NVIDIA announced an update to its Deep Learning Super Sampling technology, aptly dubbed DLSS 2.0.
Deep Learning Super Sampling named DLSS is an NVIDIA RTX technology that uses the power of AI to boost your frame rates.
DLSS essentially takes lower-resolution imagery, and intelligently upscales it to looks like native, higher-resolution output.
Performance was universally improved to varying degrees since the game was being internally rendered at a lower resolution, but image quality wasn’t always optimal and sometimes resulted in unwanted artifacts.
The old DLSS 1.0’s effect on game visuals and performance was a mixed bag, that varied from title to title.
The new DLSS 2.0 comes with DLSS 2.0 improved the quality, balanced, and performance by leveraging the Tensor cores available in its GeForce RTX-series GPUs.
Let's see one example: