LearnPress is a comprehensive WordPress LMS Plugin for WordPress, just like WordPress Moodle or Moodle for WordPress if you know what Moodle is. This is one of the best WordPress LMS Plugins can be used to easily create & sell courses online. Each course curriculum can be made with lessons & quizzes which can be managed with easy-to-use user interface. With this WordPress LMS plugin, you can quickly and easily create education, online school, online-course websites with no coding-knowledge required.
LearnPress is free and always be free, but it has premium high quality WordPress Plugin which will probably help you make money from your WordPress based LMS, try and see how it is. LearnPress WordPress Online Course plugin is lightweight but super powerful with lots of add-ons to empower its core system.