This is the 14th most frequent Croatian word.
koje
"Koje" means "which" or "that" in English, used for neuter or plural forms.
Here, 'koje' is used as an interrogative pronoun, asking about books.
Koje knjige voliš čitati?
Which books do you like to read?
In this sentence, 'koje' functions as a relative pronoun referring to 'osobe' (people).
Osobe koje dolaze kasnije će nam se pridružiti.
The people who are arriving later will join us.
Here, 'koje' acts as a relative pronoun referring to 'torbe' (bags).