Hi Noam,
There may be a few plugins that are of interest for this challenge:
If you use the Subcourse plugin (https://moodle.org/plugins/mod_subcourse), you can create a portal course with access links to all linked courses (basic, advanced, master). Since this is an activity module, you can apply regular Restrict access rules to these activities.
If you also create URLs for the courses so the participants can preview a course, once you enabled Guest access to the course. This would allow the users to at least see part of the content.
If you want to enroll users in following courses, consider the Course completed enrolment method (https://moodle.org/plugins/enrol_coursecompleted) or allow them to enroll using Self enrolment with a password/enrolment key enabled.
There may be a few plugins that are of interest for this challenge:
If you use the Subcourse plugin (https://moodle.org/plugins/mod_subcourse), you can create a portal course with access links to all linked courses (basic, advanced, master). Since this is an activity module, you can apply regular Restrict access rules to these activities.
If you also create URLs for the courses so the participants can preview a course, once you enabled Guest access to the course. This would allow the users to at least see part of the content.
If you want to enroll users in following courses, consider the Course completed enrolment method (https://moodle.org/plugins/enrol_coursecompleted) or allow them to enroll using Self enrolment with a password/enrolment key enabled.