Can you recommend any resources or tutorials for beginners on sending HTML emails with PHP?

To send HTML emails with PHP, you can use the PHP `mail()` function along with setting the appropriate headers for the email content type. You can also use PHP libraries like PHPMailer or Swift Mailer for more advanced email functionality.

$to = 'recipient@example.com';
$subject = 'Subject of the email';
$message = '<html><body><h1>Hello, this is an HTML email!</h1></body></html>';
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

// Send email
mail($to, $subject, $message, $headers);