The source provides an extensive guide on mastering the golf swing plane, specifically focusing on the common issue of a steep golf swing. It explains that the swing plane, which is the path the club travels, is critical for consistent ball striking, and a steep plane often leads to inconsistent contact, loss of distance, and common mis-hits like slices and fat shots. The episode outlines how to identify a steep swing through signs such as left-pointing divots and thin shots, and details its causes, including overactive hands and poor body rotation. Finally, the source offers practical solutions and drills to correct the flaw, emphasizing the importance of a proper setup, body rotation, and utilizing training aids to achieve a more neutral and efficient swing plane.