Beginner's Solution
Step 6: Permute corners

After solving the top surface with all yellow stickers properly oriented, what is left is the side permutation of the last layer. Permutation of corners simply means rearranging the stickers that are facing the side of the 4 corners of last layer. Skip to step 7 if the corners are already correctly permuted.

To solve the corners, we apply the 3 cycle corner permutation to swap them around. But first we need to look for this spotlight pattern:

Firstly... find the spotlight. The color and position of the spotlight is totally arbitary. The spotlight is actually a pair of solved corner in correct position in relation to each other. For now, you just need to recognize it as two corners of the same color stickers on the side (red spotlight in this diagram)

Secondly... apply the algorithm. Place the spotlight on the RIGHT, and apply the algorithm below: x R2 D2 (R U R') D2 (R U' R) x' This is the x rotation. So instead of having yellow above, the yellow is now at the back while the originally bottom white surface is facing front now.

Other possibilities There is no guarantee that you will be able to find the pair of spotlight always. There are some other possibilities For this case, you will find a straight line bar of same color stickers instead of the spotlight. Similarly, place it on your right side like so, and perform the same algorithm. It will solve the corners as well. For this case, you won't be able to find any pair of spotlight. Therefore, you have to randomly pick a side, put it on your right, and apply the algorithm. This will reduce the case to a case with the spotlight. Repeat the process and you will be able to solve it.