About OLL
There are in total 57 OLL (Orientation of the Last Layer) cases in the CFOP method. Actually it’s not necessary to learn all of them to solve a cube. Many people use only 10 of them, in a two-step manenr, which is often called double-O in the “CFOOP” strategy. Based on my personal experience, you don’t have to remembere all of them to get an average of 17s.
Here I show a chart of all the 57 OLL algorithms. They are organized in a two-dimensional way: rows/columns represent different cases of edges/corners, respectively. Yellow is the color of the upper face.
