When you're vacuuming pile carpets and rugs, you should use the turbo brush, but when you're cleaning bare floors and walls, it's best to use the wall/floor brush.
To get dust out of drawers, heating and air-conditioning vents, and from under larger appliances, try the crevice tool.
For mattresses, upholstered fabrics, curtains and car interiors, use the upholstery attachment.
And to remove dust from blinds, lampshades and moldings, use the small brush.