What is the best way to apply stain and poly sand to achieve a smooth finish on wood furniture?

To achieve a smooth finish on wood furniture, the best way to apply stain and poly sand is to first sand the wood surface evenly and clean it thoroughly. Apply the stain in thin, even coats with a brush or cloth, following the wood grain. Allow the stain to dry completely before lightly sanding the surface again. Then, apply poly sand in thin coats, sanding between each layer for a smooth finish.