When you bought your first DSLR, you probably got it with a kit lens. These lenses are cheap, and not really top-notch quality. If you bought a prime or a high-end zoom later, you know a kit lens can’t beat it. However, there are still some reasons to use a kit lens. They may not always be the best choice, but they certainly have their purpose.
I tell my students to NOT buy a new lens when they buy their first, beginner DSLR. There’s no point. The kit lens is “good enough” for beginners until they learn how to use the camera and create great images with it. Only once you know what kind of photographer you are should you start looking to buy replacement lenses.