This is the 12371st most frequent Turkish word.
hazırladığını
"That you prepared" or "what (he/she/you) prepared."
This sentence uses 'hazırladığını' to indicate a habitual action reported within a conversation.
Her gün yemek hazırladığını söylüyorsun.
You say that you prepare food every day.
In this sentence, 'hazırladığını' conveys the act of having prepared something, as reported by someone earlier.
Projenin tüm detaylarını hazırladığını belirtmişti.
She/He/They stated that she/he/they had prepared all the details of the project.
Here, 'hazırladığını' refers to the completion of a task, specifically preparing the book, which is being acknowledged as a piece of information.