When creating a course, or as an Academy Admin, you can decide whether the course should be private or public.
1) Private Mode
If your course is in Private mode, only those assigned or invited to enroll to the course will be able to see the course.
2) Public Mode
If your Course is in Public mode, everyone who has access to the category this course is under will be able to see it and enroll in it. Users can find this training in their Catalog.
The link can be shared, and people can be invited to partake in the course.
You can select if you want the course to be available to only your employees, or if guests should be able to see it as well.
Read more: Course Visibility
You will then be able to distinguish the differently published Courses (purchased, public, private) under Assign Training and Invite Learners in the Team Workspace, and Manage Courses in the Training Admin Workspace.