This is the 223rd most frequent Polish word.
polskiego
"Polskiego" means "of Polish" or "Polish" in a possessive or descriptive sense.
In this sentence, 'polskiego' is used as the genitive case form of 'polski,' modifying 'języka,' where it fits as an adjective describing which language.
Uczę się polskiego języka.
I am learning the Polish language.
Here, 'polskiego' also occurs in the genitive case, modifying 'filmu,' which establishes that it is a Polish production.
To jest fragment polskiego filmu.
This is a scene from a Polish movie.
In this sentence, 'polskiego' stands alone and is used as the genitive form of the noun 'polski,' representing the concept of the Polish language.