How can I effectively prevent and manage the growth of weeds in new grass?

To effectively prevent and manage weed growth in new grass, you can start by properly preparing the soil before planting the grass. This includes removing any existing weeds and their roots, and ensuring the soil is well-drained and fertile. Additionally, regularly mowing the grass at the correct height, watering deeply but infrequently, and applying a pre-emergent herbicide can help prevent weed growth. If weeds do appear, hand-pulling or spot-treating with a post-emergent herbicide can help manage them without harming the grass.