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The grass could be dying because it’s overwatered or underwater. Additional issues include over-mowing the lawn, compacted soil, or a fungal disease in the lawn. In many instances, regular maintenance can keep grass from dying.

Adding seed to existing grass is often known as overseeding, as opposed to reseeding. Reseeding refers to the process of filling in bare or dying patches of lawn—or in some cases, full lawns—whereas reseeding supports existing lawns to prevent thinning. Overseeding is an ideal annual lawn care practice for grass fighting drought, disease, weeds, or pest issues.

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. 

The frequency of lawn aeration depends on factors such as soil type, grass variety, and lawn usage. In general, it is recommended to aerate cool-season grasses like Kentucky bluegrass or fescue once a year during the fall. On the other hand, warm-season grasses such as Bermuda or zoysia benefit from aeration in late spring or early summer. However, it's essential to assess your lawn's specific needs, as signs of compaction and reduced grass health may indicate the need for aeration outside these general guidelines.