Bearing in mind that the boss has access to expert colleagues whom can be asked for clarifications and explanations.

Option 1: The boss uses Google themselves, thereby allowing them to find resources at an appropriate technical level and then move along the gradient of technical detail as their knowledge deepens.

Option 2: "Alice in Wonderland"...because it's the best book on anything for the layman. Alan J. Perlis, Epigram 48 http://www.cs.yale.edu/homes/perlis-alan/quotes.html

Option 3: Arbitrary poor substitute for options 1 and 2.