Translation:The conversation ends up on the front page.
"ends on the first page" (I changed "of" to "on" to correct a typo) was accepted but seems wrong, I need clarification here: 1. The conversation written on the first page, ends there. It is not continued on a following page. 2. The editor decided that the conversation was interesting enough that it belongs on the front page of a newspaper.
I think the use of prepositions is one of most difficult thing when you learn a new Language: most of time there isn't a really good reason to choose one instead of another (even in you own Language it would be difficult to explain Why you say "I'm on a football team" - for example).
I could say that "SU" is used when there is something phisically over an object (Mario è sulla scala) and when you're talking about a topic (leggo un libro sui nativi americani). But these are just the most common examples of the many meanings of "su". And they're still confusing.... I'm sorry
From what I can gather: alla is most common, nella next most, and sulla least. Alla pagina is used for text reference; to indicate a page number you drop the article and say a pagina [uno]. I think that dropping the article might also be a matter of style. Nella pagina is an alternative, and would be best if you mean "within" or "somewhere in/on". That fits Duo's usage here. Sulla pagina would be the best choice for a physical reference, e.g. a mark on the page.
I disagree with alerts. All our language learning - from infancy onwards - is done by being puzzled and learning from the resolution in that context. An alert deprives us of fixing these patterns into our neurons.
Thanks - again! :)
As for the alerts bit, I can only speak for myself. I have a somewhat photographic way of memorizing things and for me any kind of visual alert would trigger that part of my memory when it comes to recalling what I've learnt. I guess it just serves to prove that we're all individuals, with our individual learning strategies :D
For a definition and helpful examples, see http://dictionary.cambridge.org/dictionary/english/end-up