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Linux Foundation
A Beginner's Guide to Open Source Software Development (LFD102)
How to take part in open source projects.
Khan Academy
Computer Science
Free Khan Academy lessons, videos and practice exercises.
Khan Academy
Computer Programming
Free Khan Academy lessons, videos and practice exercises.
Kaggle
Python
Short hands-on Kaggle course with exercises in the browser and a free certificate.
Harvard CS50
CS50x: Introduction to Computer Science
Harvard's famous introduction to computer science and programming.
Harvard CS50
CS50's Understanding Technology
How computers, the internet and multimedia work, for non-programmers.