How can I effectively use wood filler to fill gaps in my hardwood floors?

To effectively use wood filler to fill gaps in hardwood floors, follow these steps:

1. Clean the gaps thoroughly to remove any debris or dust.
2. Choose a wood filler that matches the color of your hardwood floors.
3. Apply the wood filler into the gaps using a putty knife, ensuring it is level with the floor surface.
4. Allow the filler to dry completely according to the manufacturer's instructions.
5. Sand the filled areas to smooth out any excess filler and blend it with the surrounding floor.
6. Finish by applying a sealant or stain to match the rest of the floor.