Types of variable
Variables are nothing but reserved memory locations to store values. In this link you will get the information regarding types of variable:
https://www.tutorialspoint.com/python/python_variable_types.htm
Operators
Operators are the constructs which can manipulate the value of operands. In this link you will get the information regarding the operators.
https://www.tutorialspoint.com/python/python_basic_operators.htm
Data Types
Effective data-driven science and computation requires understanding how data is stored and manipulated. This section outlines and contrasts how arrays of data are handled in the Python language itself, and how NumPy improves on this.
https://jakevdp.github.io/PythonDataScienceHandbook/02.01-understanding-data-types.html
Hands on python
At Real Python you can learn all things Python from the ground up. Everything from the absolute basics of Python, to web development and web scraping, to data visualization, and beyond.
https://realpython.com/start-here/