Here is a video post explaining the more advanced technical aspects of a forehand.  Levers and lag in particular are the fancy things that get a lot of attention and they are essential to having a high level forehand.  But as I discuss in the video the foundation of developing coordinated power from the ground up and just basic athletic skills in general, like hand-eye coordination, are what the more advanced technical aspects of the forehand are built upon.  You have to think long-term and not skip any steps along the way.