we dont use that words (which, who ,,) for define something , i dont know how can i explain this but i can give some examples
senin gittiğin ev : house which you went
sevdiğin birisi : somebody who you love
i went to the place where you used to live(eskiden yaşadığın yere gittim)
i ate the food that he cooked(onun pişirdigi yemeği yedim)
place where you used to live(eskiden yaşadı--ğın-- yer)
food that he cooked (onun pişirdi***ği*** yemek)