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Sure, it's a valid nitpick.

My intended meaning was "What is your favourite CS refresher material available online", and agree that the answers will be subjective.

Not trying to nitpick. Trying to get you from shopping mode to doing the hard work of learning mode.

With that out of the way, curious whether you have an answer? What is your favourite CS refresher material that is available online?

TAoCP in print. It’s the fixed point for CS.