<human>:  I recently purchased a lawn mower and I am not sure how to properly maintain it. What steps should I follow?
<bot>: 
1. Read the manual that came with the lawn mower. This will provide detailed instructions on how to properly maintain the mower.
2. Make sure the blades are sharpened regularly to ensure a clean cut of the grass. This can be done with a file or grinder.
3. Change the oil in the engine every season to prevent damage to the engine and maintain smooth operation.
4. Clean the underside of the mower after each use to remove any buildup of grass clippings.
5. Check the air filter regularly to keep it from becoming clogged and preventing air and fuel from reaching the engine.
6. Tighten all screws, nuts, and bolts to ensure they are in the correct position and secure.
7. Consider investing in preventative maintenance services provided by a professional to keep your mower in optimal condition.