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A lawn that suddenly and quickly turns yellow is typically the result of a dramatic change in the grass's environment. Heavy rainfall can dilute soil nutrients, rapidly yellowing the grass, and dull lawn mower blades can dry out and damage the grass in a short time. Over-fertilizing can yellow a lawn within a matter of days. 

Lawn aeration and dethatching are meant to solve the same problem, loosening up compacted soil so that the root systems can grow and receive more water, oxygen, and nutrients. Aeration is the gentler option and often the preferable one. Dethatching completely tears out the thatch layer of the lawn and can inadvertently yank out healthy grass if done incorrectly. Aeration loosens the soil and only removes small cores of it.

If your lawn hasn't been aerated in over a year, or the soil is incredibly compacted, do two passes with the aerator. The first pass should follow your mowing pattern and the second one should form a perpendicular angle relative to the first. Stick to 20 to 40 holes per square foot as a rule of thumb.

Yes, after the lawn is overseeded post-aeration, most of the seed germinates in the aeration holes. This leaves the soil undisturbed while lush and healthy grass will grow in the holes' place. The point of this is to create extra turf density in areas that really need it, such as a large patch of dead grass where a shed used to be.