The answer to 'best aeration' is that regular core aeration is one of the most effective ways to improve the health and appearance of your lawn. Core aeration involves using a specialized machine to punch small holes in the soil, which helps to break up compaction, improve oxygen and water penetration, and encourage deeper root growth.
The best time to aerate your lawn is typically in the fall, when the grass is actively growing. This allows the lawn to quickly recover and fill in the aeration holes. Aeration can also be done in the spring, but the lawn may take longer to recover. It's generally recommended to aerate your lawn once a year, or more frequently if you have heavy foot traffic or clay-based soil.