<script src="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/js/all.min.js"></script> code example
Example: font awesome cdn
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">