To determine the amount of uncertainty of a topic, look at:

The number of options available * the variability within the content

This value is inversely proportional to how much we truly know about a topic.  The higher the number, the less we know.

Look at the number of options available when you seek knowledge about leadership, dieting, fitness, or relationships.

 There is no single solution. 

The answer is too personal, too dynamic, and ultimately unknown.

Be mindful of speaking or acting with authority in the areas where simple solutions do not exist.