Yes the categories table above the question entry box.
The other reference may be to a module rather then a plugin, either way it is the one that displays "most popular" page, "resolved" etc. in the module positions.
At the moment there is little to differentiate between the categories or the questions that are listed in these locations.
corejoomla.com is not affiliated with or endorsed by the Joomla! Project or Open Source Matters. The Joomla! name and logo is used under a limited license granted by Open Source Matters the trademark holder in the United States and other countries.