How can I achieve a durable and glossy finish on my table top using polyurethane?

To achieve a durable and glossy finish on your table top using polyurethane, follow these steps:

1. Sand the table top to create a smooth surface.
2. Apply a coat of polyurethane using a brush or roller, following the manufacturer's instructions.
3. Allow the first coat to dry completely before sanding lightly and applying additional coats as needed.
4. Sand between coats for a smooth finish.
5. Once you have achieved the desired level of gloss, allow the final coat to dry completely before using the table.