A good cheatsheet should provide a high-level overview of important concepts to prompt recall and identify areas for review. I'm quite a fan of creating learning references, so this is my own effort to collate cheatsheets that I've found useful. I try my best to make these available in PDF format.
Happy to accept any contributions or corrections! Do create a PR or issue if you find any errata.
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UseTheKeyboard, KeyCombiner - Comprehensive collections of shortcuts
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roadmap.sh - Visual roadmaps to get you started on learning new languages, frameworks and skills in tech
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X in Y minutes, Devhints - Community-driven overviews of programming languages, frameworks and more
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VisuAlgo - Visualizations and walkthroughs of common algorithms
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WizardZines - Fun, interactive, free programming zines