How Do I Level a Lawnの注目されている理由を専門的かつ分かりやすくまとめました。全体像を一目で把握できます。

Once you’ve leveled all the bumps and dips, give the whole lawn a light topdressing—a very thin layer of fine soil over everything. Then, drag your lawn roller over it (empty or half-filled) to settle it all down. Do not roll it full of water like it’s a steamroller. That compacts the soil and your grass roots will hold a grudge.

Finally, water deeply and throw down some grass seed on any bare patches. You want a smooth, green carpet, not a bald look. In two weeks, you’ll have a lawn so flat you could play billiards on it. Well, almost.