Titles that ask "X on Y", are they permitted? Two recent examples:
The title of the question does not have to be a question itself. The only requirement is that it clearly and specifically describes the topic of the question. If the question can be summarised in one sentence, that is usually a good title. When the question is "What does Nietzsche say about alienation?", I don't see the problem with the title "Nietzsche on the idea of alienation".
Some examples of good titles:
Some examples of bad titles: