HTML

Install Font Awesome 5 with NPM

    npm install --save @fortawesome/fontawesome-free

    // or:
    // also you can install Vue and React components.

    npm install --save @fortawesome/vue-fontawesome
    npm install --save @fortawesome/react-fontawesome

1.
// you can import the module in your js code.

import '@fortawesome/fontawesome-free/js/all.js';

2.
// if you are using Sass, you can import the module in app.scss.

@import '~@fortawesome/fontawesome-free/scss/fontawesome';
@import '~@fortawesome/fontawesome-free/scss/<type>';

how to install font-aweseome usin npm

<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" />