> The hard part of startups is product: knowing what to build, and being able to build it Definitly true. Recently I've written a piece of software that I need

> The hard part of startups is product: knowing what to build, and being able to build it Definitly true. Recently I've written a piece of software that I need myself, and I released it as a product but the response is not good. If this were my main startup product, I believe I would be broken. That is, I did not find the right product to build, I think it is need by people, but it is actually not. Also, after a product in need is built, you should promote to make it known by people who need it.