[lesiki]

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.

[brudgers]

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

I mean here’s the BG paper: https://dl.acm.org/doi/pdf/10.1145/322186.322188

[lesiki]

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

[brudgers]

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