This is the 15153rd most frequent Turkish word.
sitelerine
"Sitelerine" means "to their sites" or "to their complexes" in English.
The word 'sitelerine' here is used to indicate belonging ('sites of theirs') and shows the direction of action ('going to').
Kullanıcılar, bilgiyi toplamak için çeşitli sitelerine gidiyor.
Users go to various sites of theirs to collect information.
In 'sitelerine', it implies possession ('their sites') and also the target ('added to').
Şirketler, sitelerine özel bir düzenleme ekledi.
Companies added a special design to their sites.
The word 'sitelerine' refers to direction or target ('to the educational sites'), sans ownership.