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Yes, you can throw seed on a lawn and hope it grows, but taking a few steps beforehand, such as dethatching, aerating, or raking, will give the seed a better chance of germinating. While it sounds like it’ll save time, throwing seed on the lawn without doing anything will require much more seed than any other method.

There are several possible reasons why your Bermuda grass is not thick, with the biggest reasons being too little water, too much shade, compacted soil, drainage issues, and too few nutrients in the soil. Bermuda grass needs frequent and direct sunlight to stay thick, so thinning grass is likely the result of a lack of sun. 

Using specialized equipment, they aerate thoroughly, alleviating compaction and enhancing root health.

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.