This is the 767th most frequent Russian word.
польше
"Польше" is the dative case of "Польша," meaning "to Poland" or "for Poland" in English.
In this sentence, 'Польше' is again in the prepositional case, indicating the place where events occur.
В Польше проходят культурные фестивали.
Cultural festivals take place in Poland.
'Польше' is in the prepositional case, used with the preposition 'о' to indicate the topic of discussion.
Учитель говорила о Польше и её культуре.
The teacher spoke about Poland and its culture.
Here, 'Польше' is a prepositional case of the noun 'Польша' (Poland), used after the preposition 'в' to indicate location.