PaidMemberships Pro is one of the most popular free membership plugins available for WordPress with robust user statistics and reporting of membership levels. With this integration, you can create membership level access and associate the access levels to LearnDash courses. Customers are auto-enrolled into courses after signing-up for membership. Associate membership levels to one or more courses: create a membership level and map it to one, or multiple, LearnDash courses. When the membership level is purchased, the user is auto-enrolled into the associated courses.

Auto-expire membership levels after “X” amount of time: Create membership levels that are indefinite, or expire them after a certain amount of time. Create trial membership: levels with various payment gateways
Offer a limited-time free trial to people to entice them to purchase full access to your courses.