Depending on the two levels of flooring that are going to be next to each other, you will need to use an endcap, reducer or T-molding. T-molding is used when the two floorings are the same level. An endcap and reducer need to be used when the levels are different - vinyl plank, carpet or hardwood. These pieces come in most of the floor colors to make the transition to different flooring feel and look seamless.