How can I effectively use a lawn roller to improve the appearance of my lawn?

To effectively use a lawn roller to improve the appearance of your lawn, first ensure the ground is slightly moist but not wet. Then, roll the lawn in a back and forth pattern, overlapping each pass slightly. This will help to flatten the surface, remove bumps, and create a more uniform appearance. Avoid rolling the lawn too frequently or in wet conditions to prevent damage to the grass roots.