To plant grass seed, prepare the soil by removing debris and weeds. Loosen the soil with a rake or tiller. Spread the grass seed evenly over the area using a broadcast spreader or by hand. Lightly rake the seeds into the soil, ensuring good seed-to-soil contact. Water the area thoroughly but gently to keep the soil consistently moist. Protect the seeded area from heavy foot traffic until the grass establishes. Water regularly, keeping the soil moist until the grass seedlings are established.