important command.txt

bash $

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npx -g create-react-app my-app

npm start ---> to start react server 

npm run build -->Building for Production: When you’re ready to deploy your app, you can create a production build using
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npm i -d nodemon 

-d refers to dev dependency 

nodemon .\index.js    to run mongodb server
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if nodemon isn't working do this in windows power shell 

Windows PowerShell
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PS C:\Users\user> Set-ExecutionPolicy RemoteSigned -Scope CurrentUser
PS C:\Users\user> Set-ExecutionPolicy Unrestricted -Scope CurrentUser
PS C:\Users\user> Get-ExecutionPolicy
Unrestricted
PS C:\Users\user> npx nodemon .\index.js
  Usage: nodemon [nodemon options] [script.js] [args]

  See "nodemon --help" for more.

PS C:\Users\user>
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run both backend and frontend 
npm run both