Depending on your organisation's system configuration will depend on the look of the catalogue but it's where you can find a full list of courses that you have been assigned to either mandatory or optionally.
The catalogue is generally split by course categories, making it really easy to navigate to a course that you need.
You can also use the 'sort by' list or the search field to refine your search criteria.
Top tip - if you want to just look at optional courses use the 'hide assigned' toggle to remove mandatory courses from the catalogue view.
