How should I properly overseed new sod to ensure a lush and healthy lawn?

To properly overseed new sod for a lush and healthy lawn, wait until the sod is established before overseeding. Use high-quality grass seed that matches the existing sod. Prepare the soil by loosening the top layer and removing debris. Spread the seed evenly and lightly rake it into the soil. Water regularly to keep the soil moist until the new grass is established.