Hi, Nadya! First, refer to my answer https://www.italki.com/question/283340 만들다 means "make something" 만들어 놓다 means "make something and keep it some place" 엄마가 밥을 많이 만들어 놓았어요. Mom prepared lots of meal (for later) 가: 무슨 음식을 만들어 놓을까요? (What food shall we make for someone to eat for later?) 나: 비빔밥을 만들어 놓자. (Let's make bibimbap for someone to eat for later. ) 가: 무슨 음식을 만들까요? (What food shall we make?) 나: 비빔밥을 만들자.(Let's make bibimbap )