Na tej stronie książki jest ciekawy opis.

to be

Breakdown of Na tej stronie książki jest ciekawy opis.

• książka: the book
• na: on
• ta: this

Questions & Answers about Na tej stronie książki jest ciekawy opis.

Why is it na tej stronie and not na ta strona?

Because the preposition na requires the locative case when it means location, and both ta and strona have to change form.

• ta → tej
• strona → stronie

So:

• ta strona = this page (dictionary/basic form)
• na tej stronie = on this page

This is very common in Polish: after a preposition, the noun often changes case, and any adjective or demonstrative word changes with it.

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Why is książki in that form?

Here książki is in the genitive singular because it means of the book.

So the phrase:

• strona książki = page of the book

This is a very common Polish pattern:

• okładka książki = the cover of the book
• autor książki = the author of the book
• tytuł książki = the title of the book

So in the full sentence:

• na tej stronie książki = on this page of the book

It is not locative here, because książki does not depend directly on na. It depends on stronie.

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Why is it książki and not książce after na?