Debugging is a powerful process and often required to fix bugs. You can either run debuggers such as gdb from the command line, or you should be able to connect the gdb to a debugger server running on a remote device. Running a GUI-based debugger is much more fun. You should be able to debug your Qt app running on your mobile or embedded device from Qt Creator over a remote connection.
The next step is to deploy your application. We will explore various ways to deploy your application on a few different mobile and embedded platforms.