Explain the right answer of the given questions

Question 1- Why do large aircraft have their engines mostly on the wings, while smaller ones tend to have them in the tail or the tip?

Question 2- Large passenger planes almost always have their engines hanging from the wings, Fighters usually have them in the rear, and small Cessna have them on the nose.

Question 3- What is the reason for these variations in design?

I need experts help to describe why large aircraft have their engines on the wings.