How do you glue puzzles with Elmers glue?

Put a puzzle together and get a piece of cardboard just a little bit bigger/smaller OR cut a piece the same size. Glue the puzzle pieces on in this order: corners and edges first, then the next row from the outside, the next row and the next until you get to the middle. make sure it is all securely glued dowm. MAKE SURE THE PUZZLE IS SOLVED RIGHT!!!