Things that I have learned from the movie:

1* You realize giving brings more happiness and receiving.

2*Instead of bad things, you get to see good things first.

3*You can be a child without time machine.

4*I was often asked "Do you have something good?"

5*You would know how beautiful sky,stars, flowers and tree are.

Smile, and good things will happen, and it is not another way round.

All these theories sound foolish. Yet it makes sense haha.