How do you extrude a path in SketchUp?

Which SketchUp tool is used to copying an object?

With the Select tool ( ), select the geometry you want to copy. Select the Move tool ( ) from the toolbar or press M. The cursor changes to a four-way arrow. To tell SketchUp that you want to duplicate the selected entities, tap the Ctrl (Microsoft Windows) or Option (macOS) key to toggle Copy functionality.

How does follow me tool work?

Just select the face and then use Follow Me; the tool automatically runs all the way around any face you have selected. You can use Follow Me another way, too: Instead of preselecting a path, you can click any face with Follow Me and attempt to drag it along the edges in your model.