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/