Are you selling course from your website. This plugin is best and yes very small but full feature for selling coures.
This provide a custom post type courses and a clean design for the font end.
When we add course we also provide one link where user can purcahse the course and complete.
It ask following information from the admin and publish to the front page
Short Title
Language
Course Buy Link
Course Price
Access
Certificate of completion
Topic Covered
Requirements
Curriculum
About this course
Notes
Resources
£ Small plugin thus put less load on the wordpress installation
You can start course selling from your site and monetize your website.