To perform many types of operations on a polygon mesh you must first select the related polygon components you want to modify.
The following table describes techniques for selecting the various types of polygon components.
While you can select UVs in the scene view, you must use the UV Texture Editor (Edit UVs > UV Texture Editor) if you want to view the layout of UVs for your polygon mesh as well as perform other UV editing operations.
You can change an existing selection of polygon components to another component type. For example, if you have polygon faces currently selected, you can change the selection so the vertices associated with those faces get selected instead. For more information see Change one type of selection to another in the Basics guide.
For example, if you select an edge and try to delete vertices, Maya automatically selects the two end-vertices of the edge and deletes them. However, if you select those two end-vertices and try to delete edges, Maya selects all edges that touch either of the two vertices and deletes them.