See the details in documentation .

Use this code to host local server

cd C:\Users\StanleyChan\SynologyDrive\Work Backup\my document\quartz
npx quartz build --serve

Use this code to sync GitHub

cd C:\Users\StanleyChan\SynologyDrive\Work Backup\my document\quartz
npx quartz sync

Use this code to push repo

cd C:\Users\StanleyChan\SynologyDrive\Work Backup\my document\quartz
git add .
git commit -m "updated"
git push