This lesson emphasizes the importance of maintaining focus on the ball during tennis shots, particularly the serve and volleys. The instructor discusses the importance of players looking at the ball, even during quick volleys, and how proper head positioning aids in making accurate shots. By practicing focus and using the correct stance, players can improve their game, especially when executing cross-court and down-the-line shots. Additionally, the lesson touches on how shoulder rotation, leg use, and quick adjustments contribute to a more effective tennis stroke.