How do you polyurethane a table top effectively?

To polyurethane a table top effectively, follow these steps:

1. Sand the table top to remove any imperfections and create a smooth surface.
2. Apply a coat of polyurethane using a brush or roller, following the wood grain.
3. Allow the first coat to dry completely before lightly sanding with fine-grit sandpaper.
4. Apply additional coats of polyurethane, sanding between each coat for a smooth finish.
5. Let the final coat dry completely before using the table.