This is the 251st most frequent Estonian word.
koju
"Koju" means "home" or "to home" in English.
The word "koju" here specifies that the action of bringing is directed towards 'to home' as the location.
Kas sa tõid piima koju?
Did you bring the milk home?
In this sentence, "koju" is used to indicate 'to home' as the destination of an action (movement).
Ma lähen koju.
I am going home.
Here, "koju" emphasizes the place of residence where the subject remained, possibly conveying an implied state from a prior activity like coming home.