First-Layer Corners

Every white corner has three colours and belongs in the bottom layer, between the two side centres that match its other two colours.

Find a white corner in the TOP layer. Read its two non-white colours — they tell you which slot it owns. Turn U until the corner floats directly above its slot, then turn the whole cube (y) so that slot is at the front-right.

Now repeat the sexy move — R U R′ U′ — until the corner clicks home with white facing down. How many repetitions depends on where the white sticker points: once if white faces right, three times if white faces up, five times if white faces front.

The trigger looks destructive halfway through, but it restores the bottom layer on every full repetition. Always finish the whole four moves — never stop in the middle.

A white corner stuck in the wrong bottom slot (or twisted in place): hold that slot at the front-right and do ONE sexy move — the corner pops out into the top layer. Then solve it normally.

This trigger is THE fundamental sequence of cubing: F2L, the faster method you will learn next, is built from it. Done-check: the whole bottom layer is solid white and the first ring of side colours matches all four centres.