What are the best practices for applying outdoor stain and sealer to protect wood surfaces from weathering and damage?

The best practices for applying outdoor stain and sealer to protect wood surfaces include preparing the surface by cleaning and sanding, applying the stain and sealer in thin, even coats, following the manufacturer's instructions, and allowing sufficient drying time between coats. It is also important to choose a high-quality stain and sealer that is specifically designed for outdoor use and to reapply as needed to maintain protection.