Answer 1

http://www.tkdocs.com/tutorial/
https://www.python-course.eu/python_tkinter.php
http://zetcode.com/gui/tkinter/
https://pythonprogramming.net/python-3-tkinter-basics-tutorial/
https://www.tutorialspoint.com/python/python_gui_programming.htm

Answer 2

http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/index.html