I'm a new Python programmer and I need some tips

[Qubayel]

I toke an online Python course for beginners the course was good and there was an final project on the first section, so I tried to Do it by myself by applying what I have learned, I did do it but there was no GUI on my programm so when I tried to improve my programm by adding GUI I stuck I didnt know how to link the code to the frame 

I want to know if there is a standard to build the program GUI on any program 

Like where is the best place to creacte the main window root = Tk() and the main loop 

And shold I create multiple windows or one is enough 

And so on 

Thanks