Method: Determine if lesson prereq is enabled and a prereq lesson is selected

Method: Determine if the slug (post name) of a lesson has been modified

Method: Attempt to get oEmbed for an audio provider

Method: Get the date a course became or will become available according to element drip settings

Method: Retrieve an instance of LLMS_Course for the element’s parent course

Method: An array of default arguments to pass to $this->create() when creating a new post