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Moss growing in a lawn is a sign of poor soil that makes it hard for grass and plants to grow. Moss thrives in these conditions and spreads easily, so it can quickly take over your yard if it’s lacking in nutrients, too wet, or has an excessive amount of shade. Moss in the lawn isn’t always a bad thing, but it can prevent turfgrass from forming deep roots.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

No, it's not a good idea to put grass seed directly on top of dead grass. For successful germination and growth, grass seed needs good soil contact. To prepare the area, start by removing the dead grass using a shovel or a sod cutter. Then, loosen the soil, add soil amendments if necessary, and spread the grass seed evenly. This allows the seed to come into direct contact with the soil, promoting better germination and establishing a healthier lawn.

While your lawn will reap the benefits of core aeration faster than liquid aeration, the liquid solution will last longer and have more cumulative effects. If your lawn is in really bad shape, try both. By creating holes in the soil with the core aerator, you’ll make it easier for your lawn to absorb the liquid aerator solution. You might have to apply the liquid aerator several times during the growing season, but again, the positive results will be more cumulative than with core aeration on its own.