Dirt and grit act like sandpaper on the surface of a wood floor. As 80% of dirt comes from outside, place sturdy doormats and rugs at entry points and use furniture pads under chair legs and heavy furniture.
Consider a ‘no-high-heels’ policy and be aware of pets’ bad habits and scratching. Never place potted plants directly on a wood floor.
These are just a few tips for keeping your floor at its best - if you have other issues (under-floor heating, cracks, scratches, etc) don’t hesitate to ask for advice.
For more stubborn stains or a more intensive regular (every couple of months) ‘refresher’ clean, use a recommended after-care cleaning/maintenance product and you’ll bring a new lease of life to your floor.