في هذه الصفحة قصة جميلة عن مدينة كبيرة.

Yes, في basically means in, but Arabic and English do not always use prepositions the same way.

With things like a page, Arabic commonly uses في, while natural English usually says on:

• في هذه الصفحة = on this page
• literally, it is closer to in this page, but that would sound unnatural in English

So this is a normal preposition difference between the two languages, not a mistake.

Yes—Arabic often leaves out the present-tense verb to be.

So instead of saying a word for is or there is, Arabic can simply say:

• في هذه الصفحة قصة جميلة
  literally: On this page [is] a beautiful story

This is a very common Arabic pattern. In English, we usually need there is or is, but in Arabic the sentence is complete without it.

Arabic often puts the location or setting first, especially when the meaning is something like there is ... in/on ....

So:

• في هذه الصفحة قصة جميلة
  means something like On this page, there is a beautiful story

Starting with في هذه الصفحة gives the sentence an existential feel: it introduces what can be found there.

If you started with قصة جميلة, the focus would be different.

Because هذه الصفحة means this page.

In Modern Standard Arabic, when a demonstrative like هذا or هذه comes directly before a noun in this way, the noun is usually definite, so it takes ال:

• هذه الصفحة = this page
• هذا الكتاب = this book

By contrast, هذه صفحة would usually mean this is a page, where هذه is standing on its own and صفحة is the predicate.

So:

• هذه الصفحة = this page
• هذه صفحة = this is a page

هذه is the feminine singular form of this.

The noun صفحة is grammatically feminine, so Arabic uses the feminine demonstrative:

• هذه الصفحة = this page

Also, قصة and مدينة are feminine too.

A very common sign of a feminine noun is the ending ة:

• صفحة
• قصة
• مدينة

That ending does not guarantee femininity in every single case, but it is a very strong clue and usually works.

Because the sentence means a beautiful story about a big city, not the beautiful story about the big city.

So Arabic uses indefinite nouns:

• قصة جميلة = a beautiful story
• مدينة كبيرة = a big city

This is especially natural after a phrase like في هذه الصفحة, where Arabic is introducing something that exists there:

• في هذه الصفحة قصة جميلة = On this page there is a beautiful story

If you said القصة الجميلة, you would be talking about a specific story already known to the listener.

Because in Arabic, adjectives normally come after the nouns they describe.

So:

• قصة جميلة = a beautiful story
• مدينة كبيرة = a big city

This is the normal noun + adjective order in Arabic.

Arabic adjectives also have to agree with the noun in:

• gender
• number
• definiteness
• case

So here:

• قصة is feminine singular indefinite, so جميلة is also feminine singular indefinite
• مدينة is feminine singular indefinite, so كبيرة is also feminine singular indefinite

If the noun were definite, the adjective would also be definite:

• القصة الجميلة = the beautiful story

Here عن means about or concerning.

So:

• قصة جميلة عن مدينة كبيرة = a beautiful story about a big city

The phrase عن مدينة كبيرة tells you what the story is about.

This is a very common use of عن:

• كتاب عن التاريخ = a book about history
• فيلم عن الحرب = a film about war

It describes قصة, not الصفحة.

So the structure is:

• في هذه الصفحة = on this page
• قصة جميلة = a beautiful story
• عن مدينة كبيرة = about a big city

In other words, the meaning is:

• On this page there is a beautiful story about a big city

It is the story that is about the city, not the page.

A fully vocalized version is:

في هذِهِ الصَّفْحَةِ قِصَّةٌ جَمِيلَةٌ عَنْ مَدِينَةٍ كَبِيرَةٍ

This shows several grammar points:

• في makes الصفحةِ genitive
• عن makes مدينةٍ genitive
• قصةٌ is nominative
• جميلةٌ matches قصةٌ
• كبيرةٍ matches مدينةٍ

Also, the tanwīn on قصةٌ, جميلةٌ, مدينةٍ, and كبيرةٍ helps show that they are indefinite.

In normal everyday writing, these short vowels are usually not written.

Usually, when you pause on the word, ة is pronounced like -a or -ah:

• قصة ≈ qiṣṣa
• جميلة ≈ jamīla
• مدينة ≈ madīna

In very careful reading with full case endings, it can sound different because of the ending:

• قِصَّةٌ = qiṣṣatun
• مَدِينَةٍ = madīnatin

So the written ة is often heard as -a in pause, but in fully inflected formal pronunciation it can show up as -t before the case ending.

Yes. A version with a verb is possible, for example:

• في هذه الصفحة توجد قصة جميلة عن مدينة كبيرة

That also means There is a beautiful story on this page about a big city.

But the original sentence without a verb is very natural in Arabic, especially in simple descriptive style.

If you use a verb in careful MSA, توجد matches قصة because قصة is feminine singular. You may also hear يوجد used existentially, but توجد is the safer choice for a learner aiming at standard agreement.