I'm relatively new to this, but I keep seeing people say that you need a cofounder and that almost no startups are successful with only a single founder.
Why is this so? I can see why it might be so for funded startups (since investors might take you more seriously if you have a cofounder), but does it also apply to bootstrapped startups? Should I really be worried if I'm planning on bootstrapping a startup with no cofounder?
A cofounder doesn't have to have equity or work on the project. They are the person you know who will be brutally honest with you. They have to have the ability to say, "This feature you love is stupid," and have you spend time deeply considering it. They take "you" and your author's bias (as much as possible) out of the startup.
And that's key, because if it works for you is irrelevant. It has to work for your market. No one, ESPECIALLY YOU, can say if that will be so. The best is where you can have the market itself give you feedback, but they are mostly incapable of enunciating what they truly want. So you have to guess. And when you do that, you need someone to help you winnow the chaff of what you like from the grain of what your market wants and needs.