4 Method of solving the cube 'layer-by-layer'
The so-called layered method of solving the cube is probably the most widespread. This method has a lot of variants, which either may differ little from each other, or the difference can be quite pronounced in all steps of solving the cube. The methods stated here can be combined in various ways, not so much because people select the most advantageous way, but because they have mastered only one way and not any other. Usually, when a person teaches another person to solve the cube, he will not teach the most efficient method, but the one he thinks is efficient, since he himself is limited by those algorithms familiar to him.
If you learned to solve the cube from someone else via layer-by-layer method, then this method is mostly very silly and inefficient at first, but by learning new algorithms and methods and seeking better and better ways, this method can be honed, so that you can solve the cube in 50 to 60 moves on the average. For a human being this is a very good result. Of course, it requires a great deal of effort and a good memory ready to accept tens of algorithms.
If I didn't frighten you too much, you can start reading these two sub-chapters: