There are a lot of different selection methods in AutoCAD, but a powerful tool which often gets overlooked is Fastselect (FS).
This tool enables you to select a piece of geometry and then automatically pick all geometry touching it.
- To do this type fs at the command line, then select a piece of geometry as prompted, by default this will be the geometry immediately connected to the selected piece.
If you have large, complex drawings, with overlapping geometry, you may have difficulties selecting a particular piece of geometry. With the Selection Cycling tool, when you select an object that overlaps other objects, AutoCAD displays a dialogue listing all of the overlapping geometry. Geometry highlights in the workspace as you move up and down the list.
To use Selection Cycling, first of all check you have it enabled on the Status Bar:
