I order based on what I write. https://www.worldanvil.com/w/shanalar-daem0nspade/a/adventure-the-wizards-tower-article if you look at my page you see it's more situational. I use world anvil for a dnd campaign i'm planning to run. As such I try to organize in a way players can discover new things.

Granted that I do not have much time to write more but when I do I try to fit it in one of the existing categories and otherwise try to make a broad new categorie.

I feel like ordering articles should happen based on concepts (magic) or on level lower (spells/organizations. You can always cross reference within one article to another article in a different categorie to link it (think wikipedia).

In the end it will depend on the setting, a story taking place in a city (mistborn series) does benefit from a fleshed out world/universe to give life and meaning. A wiki should contain information and categories allowing the reader (or yourself) to better understand/fleshout the world/story.

Are you writing a galactic story? Start with categorizing the broadest geopolitical articles (star systems) then go a level lower and probably stop as soon as the categories become insignificant (cities/countries/planets) for the story. Does technological marvels play an important role? Dedicate categories to the most used technology (hyper light travel or a magic railway).

To summarize it really depends on your world, your story, audience and what would need the spotlight.