How can I effectively seed a patchy lawn to promote healthy and uniform grass growth?

To effectively seed a patchy lawn for healthy and uniform grass growth, start by preparing the soil by removing debris and loosening the top layer. Choose high-quality grass seed that matches your lawn's conditions and spread it evenly over the patchy areas. Lightly rake the seed into the soil and water regularly to keep the soil moist. Consider using a starter fertilizer to promote growth. Monitor the newly seeded areas and continue to water as needed until the grass is established.