Ask HN: Where do people outside traditional HN professions go for web content?

Hi HN, If I wanted to submit quality informative material to software engineers and entrepreneurs, I would submit it to HN, and maybe a few other places. What if I want to submit material to other niches of professionals. I am looking for a place online where Realtor's go for good content, but for the sake of discussion, I would like to make a list of niche content aggregates by profession.