[PyGame] Surface and rectangle in pygame

[Windspar]

but when i have to move the object we move only the rectangle, what it means?
We move only the rectangle, and the surface? Remain in the original position?
There is a way to combine thi two object and move them with a command?
But first of all why we create a surfaces for a rectangles? we cant' t create a big surface with the dimension of the window and on this big surface create rectangles?

Rectangle is use to position the surface. It just uses the x and y.
Rectangle is also use for collisions.
Surface can be use over and over again. Just set a new position.
Why cant you have big surface ? You can a bigger surface than the screen.

Tip. Take it one step at a time. Add one line of code. Run it. To see how it effect program.