Selecting the correct material is the foundation of durability. For exterior doors, prioritize solid wood (teak or mahogany) for luxury, or fiberglass and galvanized steel for weather resistance and security. For interior doors, MDF (Medium Density Fiberboard) or Hollow Core options are cost-effective for residential use, while Solid Core doors provide superior sound insulation (STC rating of 30-35). If the environment is humid, such as a bathroom, ensure the material has WPC (Wood Plastic Composite) properties to prevent warping.