How can I stain new wood to match old wood?

To stain new wood to match old wood, start by selecting a stain that closely matches the color of the old wood. Test the stain on a small, inconspicuous area of the new wood to ensure it matches before applying it to the entire surface. Apply the stain evenly and allow it to dry completely before comparing it to the old wood. If the color is not a perfect match, you may need to apply additional coats or try a different stain color until you achieve the desired result.