"column" was not accepted for this sentence, even though it was elsewhere. What kind of column or category is Rubrik referring to generally?
Column would refer to a news article which could be seen as regularly belonging to a specific category. Such a column could be called a "Rubrik" in German.
The common use of "Rubrik" is category, and only this meaning applies to books.
And if Rubrik means category, then what is this sentence mean? ^^'
Well, a given category might be fiction, non-fiction, crime etc. So this might be a response you would get in a book-shop, library etc.