Question categories

Rather than keeping all your questions in one big list, you can create categories to keep them in.

Categories can be created or deleted at will. But :

There must be at least one category in each context. So you cannot delete the last category in a context.
When you try to delete a category containing questions, then you will be asked to specify another category to move them to.

You can arrange your categories in a hierarchy so that they are easier to manage.

The up and down arrow keys change the order in which categories which are peers of each other are listed.
You can also move a category to a new context with the up / down arrows.
The left and right arrows are used to change the parent category of a category.
A possibly quicker way to move categories is to click on the edit icon and then use the category select box to select a new parent category.