Nuestro primer script de PHP

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Primeros pasos</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>

<body>
    <?php echo '<p>Hola Mundo</p>'; ?>
</body>

</html>