The back-board is the square glass part of the basketball hoop. And the rim is the orange ring with the white dangling net. The back-board is a very simple object with only two components. The first is the glass itself, which has a designated length and heigth and there is also a white square to aim at. The white square is positioned right above the hoop and is a sort of target to throw at. If you have ever seen anyone play basketball then you most likely have seen a back-board yourself. Many people like Scottie Pippen are known for their ability to get the ball into the hoop by using the back-board.
you should try it. Most every time you hit the back-board inside the lines of the white square the ball will go into the net.