This is the 2479th most frequent Turkish word.
koyduğu
"That which (someone) has placed or put."
The word 'koyduğu' refers to the act of placing the book on the table, using the verb stem 'koy-' joined with the relative suffix '-duğu', indicating the specific location or act.
Kitabı masaya koyduğu yer hâlâ aklımda.
The place where he placed the book on the table is still in my memory.
Here, 'koyduğu' is derived from 'koy-', turning into an adjective through '-duğu' to describe the rules he established, emphasizing their origin.
Ona koyduğu kurallara uymamız gerekiyor.
We need to abide by the rules he set for him.
In this sentence, 'koyduğu' relates to the flowers placed in the garden, describing an action performed by someone and specifying who placed the flowers.