-ken is used for the beginning of an action, or during the action, -diginde, and -ince are implies the ending of the action. For examle; " gelirken su al" would mean sth like " on your way coming here get(buy) water". "Geldiginde(gelince) su al" would mean sth like "get(buy) water when you come"
this is explained in the tips
anyway <ken means while so there are two things occurring together eg i will study while listening music so studying and listening occurred at the same time
this is not the same case with using when (i will study when i listen the music ) this gives impression that i will study after finishing listening music
but there is an exceptıon when using (ken) with certain period of time eg childhood, adulthood, in such cases it will be translated as when not while eg çocuk ken means when i,you was,were child not while i was a child