How to extrude only edges I wished to extrude edges of a plane to create opened box. I have created a plane, switched to edit mode, switched to edge select, then started shift selecting edges. I can select 1, 2 or 3 edges normally, but once I select 4th edge, entire face is selected automatically.

Consequently, I can't exctrude edges, entire face is extruded.
Why and how to overcome?
https://youtu.be/fEuzIabBYLo
(I wish users were a bit more curious and explored the menus...)
The Extrude function will extrude a face.
If you olny want to extrude the edges, select the face, then use Edge&gt; Extrude Edges.

Likewise, if you want to extrude only vertices, then use Vertex &gt; Extrude Vertices