I have questions such as this about just asking questions which is not directly connected to Stack Exchange.
The way I interpret this is you essentially want to ask about general social protocols / communication strategies when asking questions (and by "asking questions" I don't mean posting questions here, I mean how to form inquiries in social situations in real life or elsewhere).
Without knowing exactly what you want to ask about it's hard to give specifics, but if your issue deals with a specific field, it might be appropriate for a site dedicated to that field.
- Many sites have a
terminology tag. If you could reduce your problem to something more specific, like particular terminology that you are confused about, you could perhaps frame it that way.
- If you have grammar / syntax problems when constructing questions, there are quite a few language sites (for English there is English Language Learners as well as English Language & Usage).
- If your issue is, say, proper etiquette when making an inquiry in the workplace there is Workplace, or if it's in an academic context there is Academia.
Those are just some select examples, but the point is: If you can reduce your communications question to a smaller, more concrete problem, or at least frame it as being specific to a certain field, you may very well be able to find a site that is appropriate.
If you think you find an appropriate site but are not sure, you can also always ask for topic clarification on that site's individual meta.
It's possible that I've completely misinterpreted your post. The other way to interpret it is you're trying to find out where to ask questions about specific sites, as opposed to the Stack Exchange network as a whole.
For that, each site has its own meta, specific to that site. You can access it by selecting "Help" from the nav bar then choosing "Meta", or by opening the dropdown menu under the logo in the nav bar and visiting the meta from there. For example, https://woodworking.stackexchange.com/ has a corresponding meta at https://woodworking.meta.stackexchange.com/.
So, for example, if you visit the Cooking site and want to find out more about what's on topic there, clarify a FAQ entry (note that most communities have their own FAQ), etc. you can ask on the Cooking Meta site.
The individual site metas are good, because while there is a general philosophy shared among all SE sites, individual communities still have flexibility and have their own rules, and asking on the individual site's meta is the best way to find out what that specific community thinks.