Solve the second layer: insert middle edges
When the four white corners are done, four non-white/non-yellow edges still belong in the middle band. The lesson highlights the edge and left vs right insert.
1. Spot the edge
Find a U-layer edge with no yellow sticker. Turn U until the side color matches a side center, then insert left or right as the lab shows. Do not worry about briefly breaking the Cross — the layer-2 algs restore it.
2. After layer 2
The bottom two layers should be a solid band. Next is the yellow face (2-look OLL), not all 57 OLL cases.