How to refinish a hardwood floor effectively and efficiently?

To refinish a hardwood floor effectively and efficiently, follow these steps:

1. Clean the floor thoroughly to remove dirt and debris.
2. Sand the floor to remove old finish and smooth out imperfections.
3. Apply a wood stain if desired, then seal with a polyurethane finish.
4. Allow each coat to dry completely before applying the next.
5. Use a high-quality brush or roller for a smooth finish.
6. Ventilate the area well during the refinishing process.
7. Follow manufacturer's instructions for drying times and application techniques.
8. Consider hiring a professional for large or complex projects.