We have the What is required for a question to contain "enough information"? question. It is linked from the Tour.
Honestly, I never read the tour, except scrolling to the end to get the [informed] badge. I never expected important information to live there. Once familiar with one site of the SE network, reading the tour was becoming boring.
Instead, I rather go to the Help center because it has much more details.
However, the mentioned wealth of information is not referred to, e.g. I expected to find above link in How do I ask a good question?. Could we please have a hyperlink there?
I found out that it is linked from What topics can I ask about here? but he Meta post is not much about the topic but about the content.