Qt and Qt Creator provide a great environment for application development, irrespective of whether you're writing console, GUI, or Qt Quick applications. You can mix and match standard C++ code with Qt, making the most of your existing skills. When doing this, you can add in things such as version control and command-line builds to your tools, giving you the ability to work in large teams and perform unattended builds of large projects using Qt. Qt has great documentation too, both bundled with Qt Creator and on the web.
With what you've learned in this book and what's available, the sky's the limit for your application development goals!