After creating the Qt project and defining the resources for the app, you can build its binary to verify the correctness of the code and the project configuration.
Qt Creator starts building the application and displays the QCC output in the Compile Output window.
If the application builds successfully, the binary will be in the build directory specified in the General section of the Build Settings page, which is accessed by clicking the Projects icon on the left side and then selecting the QtApp project.
If the build fails, you can review the messages shown in the Compile Output window (which is accessed by clicking the button with the same name at the bottom) to determine the cause of the failure and then take corrective action to fix the project.