How can I effectively reseed my lawn that has weeds present?

To effectively reseed a lawn with weeds present, you should first remove the weeds by hand or with a weed killer. Then, aerate the soil to improve seed-to-soil contact. Next, spread grass seed evenly over the area and water regularly to keep the soil moist. Consider using a starter fertilizer to promote healthy growth. Finally, monitor the lawn for any new weed growth and address them promptly.