Many beginners' methods use this approach, and it also forms the basis of the CFOP speedcubing technique.
In step 3, the four edge pieces of the middle layer are solved.
In step 4, a cross of the opposite color is made on the last layer.
However, there are many variant techniques for the final layer, depending on whether the corner or edge pieces are solved first.
[4] For example: The CFOP speedcubing technique, developed by Jessica Fridrich and others in the 1980s, similarly divides the puzzle into layers to be solved.