While Redcore Linux defaults to the open source x11-drivers/nouveau, it does provide two versions of the proprietary graphics driver for NVIDIA graphic cards : x11-drivers/nvidia-drivers && x11-drivers/nvidia-drivers-legacy. Depending on the age of your card, you can install one or the other, as they cannot coexist on the same system.
The x11-drivers/nvidia-drivers package supports the most recent cards, and it should be your first choice if you have such a card. A list with the supported cards can be found at https://www.nvidia.co.uk/Download/driverResults.aspx/175958/en-uk.
Using sisyphus CLI:
root # sisyphus install --ebuild nvidia-drivers These are the binary packages that would be merged, in order: x11-libs/gdk-pixbuf-xlib-2.40.2 Total: 1 binary package(s) These are the source packages that would be merged, in order: acct-group/video-0-r1 sys-kernel/nvidia-drivers-dkms-460.67 x11-misc/nvidia-settings-460.67 x11-drivers/nvidia-drivers-460.67 Total: 4 source package(s) Would you like to proceed? [y/N]