What are the best techniques for applying espresso wood stain to achieve a rich and deep finish on furniture?

To achieve a rich and deep finish with espresso wood stain on furniture, the best techniques include sanding the wood thoroughly, applying a pre-stain conditioner, using a high-quality brush or cloth to apply the stain in even strokes, allowing the stain to penetrate the wood for the recommended time, and finishing with a clear topcoat for protection and shine.