How to Deploy a React-js Application

I installed serve globally by npm install -g serve command serve -s build is not running "Serve" is not recognized as an internal or external command I have successfully build the react Application. I am a bit confused what to do after build. serve is not working. also please answer what to do with server.js file in react project and how it helps in deployment

my application is running properly on local. I want it to run on my domain also.