How to solve a Rubik's cube

There are 7 steps:

In the beginning of this stage the cube is completely undone.

By the end of this stage You should solve the cross on the up face and the colors of upper central pieces of every side face should coincide with central colors of side faces.

Find one of the pieces of the upper cross and place it on the down face. Now, depending on the location of the cube colors, carry out the operation shown below.

Variant 1

Variant 2

Repeat the operation with three remained squares of the upper cross.