During the serve where must the receiver stand tennis?

Answer 1

The receiver must stand diagonally opposite to the server. For example, if the server is on the right side (thus serving to the server's left service box), then the receiver must stand to the receiver's right to be diagonally opposite to that of the server.

Answer 2

Then the opposing player must return the ball to compete for the current point.

Answer 3

the receiver waits for the server to serve the ball