Basic terms of Rubik's Cube
order: order refers to the number of blocks on each side of the Rubik's Cube, for example, each side of the third-order Rubik's Cube has3 small pieces.
Recovery: refers to the process of Rubik's Cube from non-original state to original state.
POP: Commonly known as freilein, refers to the situation where some components of Rubik's Cube are separated from Rubik's cube during restoration.
DNF: that is, Did Not Finished, which refers to the situation where the Rubik's Cube restorer feels unable to complete the Rubik's cube within a satisfactory time.

The basic concept of Rubik's Cube

our common Rubik's Cube is the third-order cube of 3x3x3 is a regular 6-face cube with 6 colors, consisting of 26 pieces and 8 corner pieces; 12 edge pieces; 6 center piece pieces (and central shaft pieces)

rack connected).

In order to describe the recovery process of Rubik's Cube, we need to be familiar with some basic concepts of Rubik's Cube.-- Surface, layer, corner block, edge block, center piece, surface position, position, and return.
Surface refers to a plane3 x 3 pieces, layer refers to 3 x 3 pieces of a plane where 3 x 3 pieces are located. Please carefully compare the difference between one side and one layer. Our rotation is one layer, complex

the original one is six sides.