TL;DR; The Help Center topic What topics can I ask about here? is confusing.
I am a seasoned Stack Exchange user, but am new to the Pro Webmasters community. I was recently closing a question on Super User, and considered suggesting it be moved to Pro Webmaster but wasn't sure if the question would be on-topic here. Naturally, I jumped to the help center under the topic What topics can I ask about here?. Below is a screenshot of the content I saw on that page:
As any lazy user would do (and lets face it, aren't we all lazy), I read the title What topics can I ask about here? and then started reading the bullet list below this heading. Now, since I am familiar with other SE sites, I knew that the first two items on the list already had a good home on the network, so I stopped and read the entire text to find out that the highlighted bold bullet list beneath the title What topics can I ask about here? is actually a list of topics I should not be asking about.
Now, I know the text explains what the list is, but I really think you should consider clearly defining what is on topic here, rather than focusing so much on what is off-topic. Stack Overflow, Server Fault and Super User all clearly list what content is on-topic before outlining what not welcome.
I think a revisiting of this page will make the experience for new users better.