Hi, welcome to Vintage Sewing Patterns! Thanks for your edit to the Simplicity 5280 page.
Welcome to the wiki.
No, there is no specific tutorial for the wiki, although the About page gives some hints and tips:
Categories are tricky, as in they are not like search tags, and when added to a page, list that pattern on the category page. We have a lot of pre-established categories, and a whole lot of messy ones that we have not had the time to clean up. Until you are more familiar, I would suggest not adding them and leaving it to the admins.
The general tutorial on how to edit does give you most of what you need, but it also takes some experience. I always edit in Source mode (tab at top of edit field), but many are very uncomfortable with that.
The way I and Petite Main (admins) learned, is by trial and error, copying what worked (in Source mode) and just doing it for years now.