Blender.org

Shift+F works, but.... what does it do, exactly(besides covering the hole)? I would really like to know.

By the way.... extruding, then Alt+M the center isn't good. Instead of covering the hole, it combines the vertices to 1. Am I doing it correctly?

How do I add a face after extruding a circle with 5 sides? I tried adding face(F Key) but it did something like Fgon or something.

Could someone please tell me.