First layer: bottom corners with R U R' U'
The sexy move is four turns: R U R' U'. Beginners repeat it until the white corner sits in the correct bottom slot — no per-case corner algs yet.
1. When to use it
After the Cross, keep white down. Bring the white corner to the U layer above its slot, then run the sexy move. If it is not solved, repeat the cycle — the in-app lesson highlights the corner and counts cycles.
2. This is not full F2L
F2L inserts a corner+edge pair together. Beginner layer 1 only cares about corners; middle edges wait for layer 2. After you can solve, learn 41 cases in F2L practice.