“Start small. Start with an actual problem either you or someone else experienced because I guarantee you if you have this problem there's at least one more person on this earth with the same problem and that should be enough to start this project.”

Pick A Real Problem You Or A Friend Already Has — One Other Person Is Enough

Chris validated his wishlist app by scratching his own itch, since he was still tracking his Christmas list in an Excel sheet. He argues that if you personally have a problem, at least one other person on earth shares it, and that's enough signal to start.