In a course the course owner can set the access configuration that also guests get access to the course.
The following course elements can be seen by guests:
If you want to give a guest a direct access to a course, you can send him the external link for the course. It is important, that the course is activated for guests in the access configuration. The external link can be found on the info page of the course.
[Gesamten Text in neue Seite verschieben siehe Customizing]
Still in the administration, but now under Customizing → Sites can be defined for which sections guests should get access to. If guests should get access to courses, either the catalogue or the courses need to activated for guests. If the courses wich are accessible for guest should appear in the catalogue, they need to be added to the catalogue. This can be done by the course owner, the catalogue manager or the system administrator.