I get the most inspiration from comments in Ask HN posts. And the most useful ones tend to be to questions in the form of "How do you deal with this business/technical challenge/situation?".

While the "Successful one-person businesses", "Successful passive income sources", etc., posts are popular and entertaining, I get less helpful details from them.

But folks providing details on their successes and/or failures around a more specifically-oriented question tend to lead to some interesting discussions and leads on people and their work that they may not divulge in the more show-and-tell-style posts.