freecodecamp.org
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freeCodeCamp.org is a nonprofit, open-source platform that provides a completely free, in-browser coding curriculum with thousands of challenges and projects. It covers JavaScript basics (including variables and data types), web development, algorithms, and other topics through guided paths and certifications.
More resources on Variables & Data Types
MDN Web Docs - Variables
Detailed guide for JavaScript variables
W3Schools Python Variables
Interactive tutorial on variables and data types
Python 3 Full Course for Beginners - Variables Section
freeCodeCamp's comprehensive Python course starting with basics
Intro to Programming
Learn about variables and data types in this introductory programming course. Brought to you by Pimoroni!
CS50's Introduction to Programming with Python
An introduction to programming using Python, a popular language for general-purpose programming, data science, web programming, and more.
Python for Everybody (Getting Started with Python)
This course aims to teach everyone the basics of programming computers using Python. We cover the basics of how one constructs a program from a series of simple instructions in Python. The course has no pre-requisites and avoids all but the simplest mathematics. Anyone with moderate computer experience should be able to master the materials in this course. This course will cover Chapters 1-5 of the textbook “Python for Everybody”. Once a student completes this course, they will be ready to take more advanced programming courses. This course covers Python 3.