In the video, a person is writing on a blackboard with white chalk. The person writes the letters "D", "N", "E" in a vertical line. The blackboard has a grid drawn on it, and the person writes the letters on the grid. The person's hand is visible, and they are wearing a gray shirt. The video is shot from a close-up angle, focusing on the blackboard and the person's hand. The lighting is bright, and the chalk is white. The person's handwriting is neat and legible.