Hi @cdhiraj40,
I don't know if you still need it, but to deploy on gh-pages you gotta do the following adjustments:

• add "homepage": "https://<your_username>.github.io/<name_of_your_repo>" on top of your package.json.
  Assuming you didn't rename your repository, it should be the following in you case

    "homepage": "https://cdhiraj40.github.io/Portoflio"

• add the following lines in the scripts section of the package.json

    "predeploy": "npm run build",
    "deploy": "gh-pages -d build",

• specify the basename prop to your Router in App.js as follows

  return (
        <Router basename={process.env.PUBLIC_URL}>
           ...

• eventually, run npm run deploy and it will produce a production build and push it to a branch named gh-pages. Make sure to select that branch as source for the deployment (from your repo's settings).

You are done!

Thank you @mspronesti,
I did the adjustments you've mentioned but the cmd window just says "Error: error:0308010C:digital envelope routines::unsupported" when I run "npm run deploy ". I don't know what's going wrong...

Hi @Yuxiang-Kang,
I only tested the above steps on Linux. Try replacing the start entry in your package.json with

"start": "react-scripts --openssl-legacy-provider start"

Hope it solves your problem :)