Not a tutorial but good info and keywords https://www.intel.com/content/dam/develop/external/us/en/documents/open-source-uefi-firmware-for-intel-platforms-82541

Not a tutorial but good info and keywords https://www.intel.com/content/dam/develop/external/us/en/documents/open-source-uefi-firmware-for-intel-platforms-825417.pdf https://www.intel.com/content/dam/develop/external/us/en/doc... Also this might be helpful: https://pete.akeo.ie/2015/01/easily-create-uefi-applications-using.html https://pete.akeo.ie/2015/01/easily-create-uefi-applications... and if you choose edk2: https://www.tianocore.org/ https://www.tianocore.org/