Offering a Free course can help you earn not just revenue, but also more email subscribers and leads for your paid courses.
By providing the course registration link, people can register and get access to the course for free.
Delivering the Registration Link
Opt-in - By adding an opt-in form you can easily send the registration URL with your autoresponder.
Copy the Registration URL from the Member page
And in your autoresponder add the URL in your welcome email, newsletter, or other email.