In this Overview of org-drill, what is the difference between "drill item", "drill topic", and "org topic"?
Here is a quote from the "Introduction" section:
Each topic is treated as a "flash card". The material to be remembered is presented to the student in random order. The student rates his or her recall of each item, and this information is used to schedule the item for later revision.
Here is a quote from the "Writing the questions" section:
Org-Drill uses org mode topics as 'drill items'. To be used as a drill item, the topic must have a tag that matches the value of org-drill-question-tag. This is :drill: by default.
Drill items can have other drill items as children. When a drill item is being tested, the contents of any child drill items will be hidden. You don't need to schedule the topics initially. Unscheduled items are considered to be 'new' and ready for memorisation. How should 'drill topics' be structured? Any org topic is a legal drill topic – it will simply be shown with all subheadings collapsed, so that only the material beneath the main item heading is visible. After pressing a key, any hidden subheadings will be revealed, and you will be asked to rate your "recall" of the item.
The page contains 16 occurrences of "drill item", 5 occurrences of "drill topic", and 2 occurrences of "org topic".