This is the 312th most frequent Croatian word.
brojne
"Brojne" means "numerous" or "many" in English.
In this sentence, 'brojne' modifies the noun 'mogućnosti', indicating a large quantity or diversity of opportunities.
Brojne su mogućnosti za učenje jezika danas dostupne.
Numerous opportunities for language learning are available today.
The word 'brojne' is used as an adjective in plural form, describing the quantity (numerous) of the landmarks (znamenitosti).
Na putovanju smo vidjeli brojne znamenitosti.
During the trip, we saw numerous landmarks.
Here, 'brojne' describes 'tradicionalne igre', showing that the book covers a wide variety of traditional games.