Hello and welcome!
If you already figured GUI apps are an interesting and worthy goal for you to pursue, then you can jump in one of several GUI frameworks available in Python (wxPython, Tkinter, Kivy). You can even find some tutorials on our forums.
For GUI apps it will be handy to know OOP in Python. And also some networking, if you will want to have internet connection functionality. Databases can be a useful addition too. This leads to Python web frameworks, if you would like to develop web applications using Python. There are several nice frameworks to choose from as well (e.g. Django, Flask, Bottle).
If you already figured GUI apps are an interesting and worthy goal for you to pursue, then you can jump in one of several GUI frameworks available in Python (wxPython, Tkinter, Kivy). You can even find some tutorials on our forums.
For GUI apps it will be handy to know OOP in Python. And also some networking, if you will want to have internet connection functionality. Databases can be a useful addition too. This leads to Python web frameworks, if you would like to develop web applications using Python. There are several nice frameworks to choose from as well (e.g. Django, Flask, Bottle).