Step 4:
How To Make Yellow Cross
So far we have solved two bottom layers and only the yellow face is left. In this fourth stage of our Rubik's tutorial we want to form a yellow cross on the top of the cube. At this point it doesn't matter if the edge pieces don't match the color of the side center pieces. We will switch them in the fifth step.
There's a short Algorithm we have to use: F R U R' U' F'.
Besides the solved position there are three other possible patterns: a dot, an "L" shape or a line as illustrated below. In case of the dot you'll have to do the algorithm three times. When there's an "L" shape then twice. Case of a line, apply once. See the picture below to understand how this algorithm changes the top layer of the Rubik's Cube. The orientation of the cube is important, so the "L" shape is twisted as illustrated and the line must be horizontal.
See the give above images to understand the holding of cube while applying algorithm.
A "Dot"
"L" shape
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