Memberships
Memberships are a great way to build recurring revenue. Instead of charging a fixed price for a course, you can include it (and other courses) in a membership tier and charge a subscription fee per month or year.
Beginner
$19/month
Here, you can write whatever you want.
Advanced
$29/month
The same goes for this paragraph right here.
Pro
$39/month
This one too!
If you want.