Official Python documentation: https://docs.python.org/3/

Python for Everybody: https://www.py4e.com/

Learn Python the Hard Way: https://learncodethehardway.org/python/

Python Crash Course: https://nostarch.com/pythoncrashcourse2e

Python Data Science Handbook: https://jakevdp.github.io/PythonDataScienceHandbook/

Python standard library: https://docs.python.org/3/library/index.html

Real Python: https://realpython.com/

Codecademy Python course: https://www.codecademy.com/learn/learn-python-3

Python for Data Science Handbook: https://jakevdp.github.io/PythonDataScienceHandbook/

Python Software Foundation: https://www.python.org/