This goes to show just how badly #
Hubzilla needs its documentation reworked.
Where you'd expect a user manual, you find a technical specification. It is so undermaintained that parts of it still mention tech levels which have been discarded in the last decade already AFAIR. And it isn't even complete.
For example, there is no documentation for the wiki at all. The only thing you learn about it is that it accepts BBcode and Markdown. Everything else is trial & error or knowing the right places where to ask for help.
Hubzilla lets you have multiple wikis on your channel. I've just accidentally discovered that "wikis" doesn't mean single wiki pages, but full-blown wikis with multiple pages each. And the first page you create is the start page. Now I have to change my plans slightly.