Read this first for some quick background information:
https://discovery.endeavouros.com/nvidia/nvidia-intro/2021/03/
Next to start the installation of Nvidia drivers, follow this wiki page:
https://discovery.endeavouros.com/nvidia/nvidia-installer/2021/03/
Third, for some additional, though optional, steps to consider read this:
https://discovery.endeavouros.com/nvidia/nvidia-optional-enhancements-and-troubleshooting/2021/03/