Your primary vGuitar is the one that you will use while playing fretboard games or using any of the practice tools on GuitarGym.
You can not sell or burn your primary vGuitar. In order to do so, select another vGuitar as your new Primary vGuitar first.
You can select a Primary vGuitar by clicking any of the vGuitars in your collection, and on the vGuitar page press 'Set as your primary vGuitar'