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When you don’t aerate your lawn, the soil will become more compact over time. This limits how much water can soak in to reach the roots of your grass, and it keeps oxygen and carbon dioxide from the plant roots. This can limit grass growth, which may sound great for limiting mowing, but it also leads to a lawn full of grass that looks dull and sparse. Eventually, compacted soil can weaken grass, while also making it more vulnerable to pests, diseases, and erosion and even causing it to die off.

Some grass types grow better than others on hard dirt. For example, hardy grass types like perennial ryegrass and Kentucky bluegrass will grow better on tough soil. Keep in mind that you should still consider your area’s climate when deciding on a grass type.

To prepare your lawn for core aeration, water it the day before you aerate. (Alternatively, you can wait until it rains and aerate the following day.) Aerating after watering or a rainy day will make the process easier since you can penetrate moist soil better than dry soil. You should also flag your sprinklers so that you don’t accidentally hit them while aerating. If you have a lot of thatch buildup in your yard, you might need to dethatch your lawn before aerating as well.

You can try that, but it isn't likely to yield results. It's like watering potted plants without putting the seeds in. Most of the tossed grass seeds sit on top of the soil or existing grass blades and never germinate. The seeds need to make it into the soil, just like growing a potted plant. The best way to accomplish this is to aerate your lawn first, then overseed.