Once the white cross is complete, you can finish the first layer by inserting each white corner between its two matching side centers. Hold the solved cross on the bottom so you can see the unsolved top layer.
Follow the lesson
Find a white corner in the top layer
Identify a corner by its three colors. It belongs between the three corresponding centers.
Place it above its destination
Turn U until the corner sits above the matching corner slot. Keep the destination at front-right to make the next steps easy to follow.
Repeat a short insertion trigger
Use R U R’ U’ to cycle the corner through the front-right position. Repeat as required, watching where the white sticker goes after each attempt.
Repair a misplaced bottom corner
If a target corner is trapped in the bottom layer incorrectly, perform the trigger once to bring it up, then reposition and insert it.
Do not rotate the entire cube between repeated moves unless the instruction explicitly says to. The sequence depends on keeping the same front and top.
Practise it on a real cube
Keep your physical cube in the same orientation as the instructions. Perform each face turn slowly, stop and check the stickers, then compare with the 3D trainer. Voice lessons can guide screen-based practice; physical cube moves are confirmed by the learner rather than checked by a camera.
How to know you are ready to move on
Repeat the exercise from a fresh starting position and explain what each turn is meant to accomplish. If the result differs from the target, go back to the earliest step you can verify instead of immediately starting over. Use cube notation whenever a move symbol feels unclear.