There doesn't seem to be a page that explains what is on-topic and what is off-topic for this forum. I think there should be such a page that is easily findable by new posters. I'm not the right person to write it but without it there will continue to be off-topic posts.
May want to put such a summary on the About page.
I see the following on the left hand side of the home page. Each category has its own description for what is appropriate. What do you think is missing/what more should be added here?
Imo the Development category could use a renaming or at least more clear wording that it is about compiler development, not development in Swift, which seems to be a common misunderstanding.
The Using Swift category could maybe use a note that it's not for Apple framework specific questions, but I'm not sure how much people actually read those
If there were a single pinned page "Is my question on-topic or off-topic" that listed examples of on-topic and off-topic questions and explained the reasons as well as pointing to other forums for the off-topic questions that would prevent some of the off-topic questions. It could also more easily be the response to off-topic questions.
Look at this thread: https://forums.swift.org/t/problem-xcode-emulator/37843 OP got angry when told (politely) that his question was off-topic. How is he supposed to know? His question probably agrees with that brief description of Using Swift.