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DevHints: A great resource of cheat sheets for a wide range of technologies.
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Git Cheat Sheet: A cheat sheet that features the most important and commonly used Git commands for easy reference.
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HTMLCheatSheet: A reference sheet for HTML, CSS, and JavaScript that includes helpful code structures (e.g. for setting up a blank page, tables, charts, etc.), and helpful tools such as an RGB color picker, iframe generator, and placeholder text generator.
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Jekyll Cheatsheet: An excellent resource for learning Jekyll variables and filters.
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Markdown Cheat Sheet: Everything you need to know about Markdown laid out in a PDF format.