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Proposal to reuse exactly the same article naming conventions as the nLab without modification: https://ncatlab.org/nlab/show/HowTo#naming
In particular "page articles should be singular nouns"
We don't yet have a quorum here to set binding style guidelines. But we can try to come up with recommendations. But if we can't agree on something, let's temporarily leave room for people to write in the style they feel comfortable with. Once we have some content and more contributors, we can have a wider discussion and clean up any inconsistencies.
The nLab naming conventions look well thought out. I propose to provisionally accept these naming conventions for categories that are "reference dictionaries," including the the category "definition."
For other categories - including the new category "tutorial" - I propose to follow standard rules for capitalization of article titles -- capitalize just the first word, except for words that always get capitalized. It reads well: "My journey across the sea"; "My journey to Ithaca".
Just edited my proposal above, to use simpler language.
Another suggestion. For any article, one could make a "personal version" by qualifying it with your name, e.g., "monad (Tanzer)". That means that (unless you say otherwise) you are asking to be the sole editor. OTOH articles not qualified this way are shared content, which everyone is free to work on.
I would use this to make draft articles for the glossary, and get feedback before "publishing" them. Not that I'm recommending that everybody do this. I would choose to do this is because I am not very experienced with CT and it would increase my comfort level. For someone who is "in the business" it probably makes sense to just go for it.