Resources to practice from examples:
I feel this is the best resource to learn (lots of working examples for most of the Python GUI-related requirements): https://github.com/PySimpleGUI/PySimpleGUI/tree/master/DemoPrograms
Resources to install and start:
https://realpython.com/pysimplegui-python/#getting-started-with-pysimplegui
Other Resources:
https://www.tutorialspoint.com/pysimplegui/pysimplegui_quick_guide.htm
https://python.hotexamples.com/examples/-/PySimpleGUI/-/python-pysimplegui-class-examples.html