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To reseed an existing lawn, or fill in bare patches, you need to check your soil first.
If the soil is hard and compacted, use a core aerator to loosen it up. (An aerator pulls up plugs of soil from the ground, which can be crumbled later with a rake or the plugs can be left to decompose.)
If the soil is fairly loose, using a rake to roughen the surface, will create a better medium for the seed.