help to understand making process

[Dario Folliero]

1. Select "Orient the manipulator to the world"
2. Select "Move adjacent data" (otherwise your vertices won't move)
    Toggle selection through transparent objects (otherwise you cannot select through the transparent stud)
3. Select "Vertex mode"
4. Press the "Select" button (within 6.) and select all the vertices along that hypothetical line which should me moved. The selected vertices turn red.
5. Select "Move the manipulator to the nearest vertex"
6. Switch from the selection mode to the move mode (the manipulator becomes visible)
7. Use the x and z arrows to move all vertices out of the stud

Use the Snapping grid (near the world icon) to finetune your movements. You have to hover over the arrows until they switch to a yellow color to activate the actual movement. The vertices will only move as long as the arrows are yellow. Experiment with the selection/movement.

w.

i think i fix this part.

What is the purpose of drawing the edges?