In the tutorials, where extrude is used, people remove these overlapping polygons and close the resulting holes through the "close polygon window". In general, I'm trying to understand how to rationalize the operation "Extrude". Because on the MAXON site I found such a thing in the description of the "polygon pen" - https://www.MAXON.net/en/products/cinema-4d/features/modeling/polygon-modeling/