You can find more information on the speaker's site:
When attempting to learn Dancer I ran into the problem that all the documentation started from "Here is a 'Hello World' script". But that was assuming many things were set up and configured and that just was not true, at least not on my server.
This is a collection of what I learned.
Plus a few comments of what would be different if you wanted to use Mojolicious rather than Dancer.