A free Khan Academy unit on information theory, part of its computer science section, covering how information is measured and compressed. Commenters point to it as a solid starting resource for CS fundamentals.

One commenter calls the Khan Academy information theory material "really great" when asked for CS fundamentals resources.

What commenters said (1)

1. Recommendsdddw2019in “Ask HN: How do I choose the right resource to learn CS fundamentals?”

   I really recommend Lynda ( now linkedin learning) not free (but remaking accounts works ofcourse), unless you signup via new york or LA library. also khan academy: information theory is really great: https://www.khanacademy.org/computing/computer-science

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