Expand...on star, rectangle, polygon, ellipse?

I know this is a basic question, but I need to ask! If I create text, I know there is an option to create outlines, which makes it uneditable text and simply outline forms. If I create an oval, rectangle, polygon, or star with only a fill and no outline, do I need to use the Expand command to turn them into editable shapes in a similar way?  When I use the Expand feature on the shapes, it appears that nothing changes. If I double click on an anchor point, I can then edit the shape. Do I only need to use the Expand command on one of these shapes if they have strokes?

Thanks in advance, MJ