I just read an article that summed up some common mistakes when starting a business that rung true to me. They mentioned the following (which I’ve put in the order I think is most important):

  1. Not focusing on the user
  2. Not having enough infrastructure (money + time)
  3. Forgetting about branding, marketing and sales
  4. Trying to do everything (similar to #2)
  5. Staying in “Stealth Mode” too long

Have a look at the original article here: