This is the 2108th most frequent Polish word.
obsługi
"Obsługi" means "service" or "operation" (genitive or accusative form of "obsługa").
Here, 'obsługi' is used in the genitive singular case, as it connects to 'klienta' (customer), forming 'customer service.'
Obsługi klienta należy zawsze traktować z szacunkiem.
Customer service should always be treated with respect.
In this sentence, 'obsługi' refers to the operation or handling of the machine, demonstrating its use as a noun.
Nie mogłem znaleźć obsługi tej maszyny w instrukcji.
I couldn't find the operation of this machine in the manual.
Here, 'obsługi' presents the plural form of the noun in a context referring to managing tasks.