Guide to edit theme?

I selected nofancy theme. Instructions on how to edit the theme’s menu? Set other links and names of links?
What language is it? Is there an irc to ask questions? Thank you.

It looks like that theme uses categories to generate the nav. See:

You should read through the docs, to get an idea of how a Hugo site is structured, I think. Hugo uses Go templates.

This is the right place to ask questions.