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The screwdriver test involves trying to push a screwdriver into your lawn. If it goes in easily, you’re likely overwatering and should cut back. If there’s moderate resistance, you have a good watering schedule and soil composition. If there’s a lot of resistance or you can’t get the screwdriver into the soil, you may need to aerate your lawn to reduce compaction and increase your watering schedule.

Yes, you can throw seed on a lawn and hope it grows, but taking a few steps beforehand, such as dethatching, aerating, or raking, will give the seed a better chance of germinating. While it sounds like it’ll save time, throwing seed on the lawn without doing anything will require much more seed than any other method.

Aeration can level your lawn if the issue is minor soil compaction, so it can help smooth things out if your yard is bumpy from foot traffic or vehicle traffic. However, it won’t slope your yard. If you have small areas where water seems to pool after precipitation, aeration could help, but larger issues with improperly sloped lawns and problems leading to foundation leaks or structural damage will require more comprehensive solutions.

If your lawn has some lumps and bumps, yes, aeration can help—although it may also be beneficial to take on other steps, like irrigation, fertilization, and dethatching (also known as scarifying). You can also use a power rake to physically break up the bumps in your lawn, which can help you achieve a more even look.