This is the 250th most frequent Czech word.
česká
"Česká" means "Czech" (feminine form) in English.
The word 'česká' acts as an adjective describing the noun 'kniha' (book), denoting that the book is of Czech origin or associated with the Czech language.
Toto je česká kniha.
This is a Czech book.
Here, 'česká' describes the noun 'studentka' (female student), indicating Dana's nationality or association with the Czech Republic.
Dana je česká studentka.
Dana is a Czech student.
In this sentence, 'česká' acts as an adjective modifying the plural noun 'piva' (beers), specifying that the beers are of Czech origin or style.