How can I effectively prevent the growth of weeds and killing grass in garden beds?

To effectively prevent the growth of weeds and protect grass in garden beds, you can use mulch to smother weeds, regularly pull out any weeds that do grow, and use a pre-emergent herbicide to prevent weed seeds from germinating. Additionally, you can create a healthy lawn by mowing at the correct height, watering deeply but infrequently, and fertilizing appropriately to promote grass growth and discourage weed growth.