Rules :: Learning how the Rook moves
Here is a set of diagrams showing the different movements of the Rook, every possible move is indicated with an arrow. When the Rook is in the center of the board, it can move to 14 different squares
In this position, the Rook is restricted in its movements by its own pieces, as it cannot jump over pieces, it can only go to 9 different squares.
As we can see from these diagrams the Rook can move in horizontal and vertical lines, all the way until it meets an obstacle (end of board or a piece).