I must be missing something...?
Following the HN link, I arrive at the github project page for KrzysztofSzewczyk/Euboea.
Scrolling down, I see in the readme text a section called Learning Euboea. That section tells me to go to the wiki (via a provided link).
Following that link, I find a wiki with three pages. Those three pages have very little substance.
Now I do notice the examples folder in the source, but even that just seems to have very limited snippets. I guess I was just expecting something different.