The function “question categories” allows you to structure your questions. This provides an advantage of not collecting all questions with different topics and subject areas in one long list. You can compare a question category with a directory: A directory contains files and subdirectories while a question category has a name and a short description. You can create hierarchies of question categories by defining subcategories in a question category. You can create any number of subcategories and link them as deeply as you would like.