To install font-awesome you first should install it with npm. So in your project root directory type:
npm install font-awesome --save
(Of course I assume you have node.js and npm already installed. And you’ve done npm install in your projects root directory)
Then edit the resources/assets/sass/app.scss file and add at the top this line:
@import "node_modules/font-awesome/scss/font-awesome.scss";
Now you can do for example:
npm run dev
This builds unminified versions of the resources in the correct folders. If you wanted to minify them, you would instead run:
npm run production
And then you can use the font.