This is the 5773rd most frequent Polish word.
włoski
Italian.
The word 'włoski' in this sentence is in the genitive case ('włoskiego') linking to the subject 'uczę', and refers to the Italian language.
Uczę się włoskiego od dwóch lat.
I have been learning Italian for two years.
Here, 'włoski' is an adjective describing the noun 'ser', specifying its origin.
To jest włoski ser Parmigiano-Reggiano.
This is an Italian cheese, Parmigiano-Reggiano.
In this example, 'włoskie' is used in the plural form to describe the plural noun 'miasta', again indicating origin or characteristic.