I'm new to blender apologies if this is a silly question, however I am trying to create a octagon face from the middle vertex of a cube, this is done in a video I was watching. I believe its an 'inset from vertex' however I'm unsure... can anyone help.. the picture below shows what I want to do, the selected face seems to be originating from the middle vertex.
Video I was watching is here and the timestamp is 0:22 https://www.youtube.com/watch?v=_7noD3zrk7Y&t=49s