This is the 797th most frequent Japanese word.
置か
"置か" is the stem form of the verb "置く" (oku), meaning "to place" or "to put."
The phrase '心に置く' (to place in one's mind) exemplifies a figurative use, implying mental consideration or remembrance.
彼は常に未来を心に置いています。
He always keeps the future in mind.
The verb '置く' (to place) is used here to describe the action of physically placing an object, the book, on a specific location, the desk.
本を机の上に置きました。
I placed the book on the desk.
'置く' is used metaphorically to indicate prioritization or comparative placement of abstract concepts, such as plans and proposals.