Hi i'd like to know how to move just one vertex, i need to change the position of a vertex but when i select and move the other vertex come together. I just started blender yesterday and today is my attempt to try model with tutorials but it still very hard!! i need to do what this guy did at https://www.youtube.com/watch?v=dgUx8v6u7tM 3:24
EDIT The Proportional Editing is already disabled

up to shrink the size of the area.