title: how and what is XCODE's Bundle ID, signing?
body: <p>sorry new to IOS programming. must i enroll to apple developer program to obtain a bundle id ?</p>
  
  <p>apparently i am trying to start my first project, but it seems like i need to choose a bundle idnentifier so that the signing tab would have no errors.</p>
  
  <p>is the signing tab required for me to make a development environment on my device ?</p>