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I'm afraid you'll have to use another online source for this. People answer tkinter and gui related questions here but there's no course, and SL is said to be not supporting Python GUI:
https://www.sololearn.com/Discuss/2710160/?ref=app
https://www.sololearn.com/Discuss/2986011/?ref=app
https://www.sololearn.com/Discuss/1456023/?ref=app
https://www.sololearn.com/Discuss/1917812/?ref=app
Tibor Santa's post in the last discussion listed here is to the tkinter tutorial on geeksforgeeks.