Restrict Content Pro makes it easy to sell access to your content, as it integrates with a number of popular payment providers.
The iThemes Security Pro plugin provides a real-time WordPress security dashboard that monitors security-related events on your site around the clock.
Kadence Theme is a lightweight yet full-featured WordPress theme for creating beautiful fast loading and accessible websites, easier than ever.
Learndash is a popular LMS for Wordpress. It is simple to use and has a lot of features. It is great for creating online courses and is very popular with educators.