font-awsome cdn
snippet in html

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user3501

<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>

font awesome bootstrap cdn

user2449

<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">

font-awsome cdn

user8561

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.1/css/all.min.css">