I need this info. to relate to one another. The question the Professor is asking

I need this info. to relate to one another. The question the Professor is asking please.
He mention this one thing and his exact words are as follows:
The Artists generation represents members born during crises and tends to be preoccupied with them, the whole Prophet generation represents those born after crises. The Hero generation is the generation that continues to challenge the norms established in Nomad generation, while the Nomad generations were born when long-norms are challenged by the incoming generation.
I know you go on to generations from this section, but is there a way that ties these terms to the actual generation discussion. I just do not see the link. Born after crisis, norms being challenged, what does that mean and how does it relate to generation of z, millennials etc.
Please assist.