Proper care is essential to keep a kukri sword in top condition. Start by cleaning the blade after each use to prevent rust, using a soft cloth and mild oil. Regularly sharpen the blade to maintain its edge, using a sharpening stone at the correct angle. Apply a thin layer of oil to the blade for added protection, especially in humid environments. Keep the wooden handle conditioned with linseed or mineral oil to prevent cracks. Store the kukri in a dry place, ideally in a sheath, and avoid touching the blade directly, as oils from the skin can cause corrosion.