There is. It's called Hacker News. There's isn't a better resource to learn more about starting a small business than HN itself. From starting a consulting business to creating a passive income, everything has been extensively discussed. There are tons of inspiring stories here about creating a small business. (Incidentally, I think it would a great idea to collect all entrepreneurship related threads in a single place.)

HN's expertise falls short when it comes to adjudicating unicorns as they don't usually look promising at the beginning. But, in case of a small product, I think community's feedback and advice can be invaluable.