There are a few things to consider when purchasing cookware for a glass top stove. First, it is important to choose cookware that has a flat bottom. This will help ensure even heat distribution and prevent hotspots from forming. Second, it is important to avoid using cast iron or aluminum cookware on a glass top stove, as these materials can scratch the surface. Finally, it is best to choose cookware with smooth, rounded edges to help prevent chipping or cracking of the glass stovetop.