1. set these for the project (name accordingly)
for REACT, publish directory is "build"
Base directory = my-portfolio-frontend
Package directory = Not set
Build command = npm run build
Publish directory = my-portfolio-frontend/build


2.
To Fix babel... warning, write this command -
npm install --save-dev @babel/plugin-proposal-private-property-in-object

Next create a new file and paste this
// .babelrc
{
  "presets": [
    "react-app"
  ],
  "plugins": [
    "@babel/plugin-proposal-private-property-in-object"
    // Add any other plugins you may have here
  ]
}


3.
In the root folder add a new file and paste it
// netlify.toml
[[redirects]]
from = "/*"
to = "/index.html"
status = 200


4. Remove all the warnings from the project