These are very important settings which bring a new level of customization to: Questions, Quizzes, Lessons and Courses.

You can access these settings by hovering over an existing item and clicking on Special Settings or when creating / editing one of the above items, at the top of the page and / or on the right hand side menu you have the Special Settings buttons.

They are different for each item, to learn more either access their respective pages or head over to the knowledge base and read about them there.