 <p>You don't need groups: you just have to make sure to disable the "self registration" option (from admin control panel: <strong>Global Configuration -> system -> Allow User Registration = No</strong>)</p> <p><img src="https://i.stack.imgur.com/JE84e.png" alt="Global Configuration"></p> <p>Also, you'll have to configure each article/menu to have <strong>Access Level</strong> "<em>public"/"registered</em>".<br><br> <img src="https://i.stack.imgur.com/gH2Tg.png" alt="article/menu permissions"> <br> You can register new users from the admin control panel and only they will be able to view "<em>registered</em>" content.</p>