I use Show HN and the discussions by commenters to get inspiration on products I could possibly build. Sometimes I get google keep out to take some notes.
The gold mine of inspiration is really in the comments. You see what people think and sometimes you're able to identify what went wrong on a product, what need is not being met and how you could potentially build an alternative.
I wonder if I'm the only one doing this.
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.
I mainly look at the ask section. I find quite a bit of useful information or book recommendations in the comments.