The Go 10.3 is the same as everything else for rooting the standard way.
- Get conversant with ADB
- Get conversant with EDL
- Use EDL to pull your stock boot image (save a copy for later)
- Install Magisk, run, transform your stock boot image
- Use EDL to flash the Magisk'ed boot image
Follow the directions for anything else here. Except use the right Firehose loader.
Completely remove anything Google require system partition modification. Disabling all of Google requires root.