the author is trying to identify the different marketing strategy for high-tech companies and ordinary companies. he points out the unique phenomenon of high tech products marketing, which requires crossing the chasm between earlier cooler adaper with bigger more profitable mainstream market.
the second point is about how to cross the chasm, a.k.a. targeting a single industry or group of users, a so-called "vertical market".
following these two points, the author rhetorically compiling many small cases without solid academic data or analysis, I am not sure why it worth that much recommendations?