Where in the new help center can I find an explanation that the scope of this site is limited to research-level math questions? There is a close reason (part of "off topic") that mentions the help center, but when I look at the help center I cannot find the explanation that is claimed. The pages https://mathoverflow.net/help/on-topic and https://mathoverflow.net/help/dont-ask are completely generic for an SE site.
The help center is a long term project that came into being because we found that many new users simply weren't finding the information needed to use the Stack Exchange system to their advantage. The FAQ gave good, general guidance but there's a lot of subtle quirks in how the platform works when you compare it to traditional forums, or even other Q&A engines.
The problem is, most of the information that would have been extremely helpful to them was more or less buried somewhere on Meta, where even advanced ninja searches often fail to turn up exactly what you're looking for. We went and collected the answers to the most frequently asked questions which are more or less vital when it comes to learning how the system works and used them to seed the help center.
Ideally, everything unique to the Math Overflow community found in your FAQ should be dispersed into various pages within the help center, and custom pages can be created as needed to fit your needs. We want to make it easy for people to find the stuff you think is vital for them to have a good experience here.
Some editing is currently underway by the moderation team, I'm sure they'll let us know what they need to get it all in order and we'll end up with a very useful resource.