avanzado
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css" rel="stylesheet">
JellyBeans
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css" rel="stylesheet"><link
rel="stylesheet"
href="https://use.fontawesome.com/releases/v5.13.0/css/all.css"
integrity="sha384-Bfad6CLCknfcloXFOyFnlgtENryhrpZCe29RTifKEixXQZ38WheV+i/6YWSzkz3V"
crossorigin="anonymous"
/># use this in the head section of html to apply the font awesome icons.
<head>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.0/css/all.css"/>
</head>
use the link for free icons from font awesome -> https://fontawesome.com/v5.15/icons?d=gallery&p=2&m=free<script src="https://kit.fontawesome.com/4ea6e3ab0b.js" crossorigin="anonymous"></script><i class="fa fa-envelope-o" aria-hidden="true"></i>
<i class="fab fa-facebook-f"></i>