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Course
Free
CS50x — Harvard's Introduction to Computer Science (Free) ↗
Harvard's legendary intro to CS, free and self-paced. Covers computational thinking, abstraction, algorithms, and data structures using C, Python, SQL, and JavaScript — the exact foundation this roadmap builds on.
Video
Free
Crash Course Computer Science (YouTube) ↗
A 40-episode series starting from the most basic underpinnings of digital computing (binary, logic gates, CPUs) and building up to modern systems. Great companion to the 'How Computers Work' and 'Binary & Number Systems' lessons.
Course
Free
Khan Academy — Computer Science ↗
Free, structured lessons on computer science theory: algorithms, cryptography, and information theory, with interactive exercises throughout.