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help
  1. https://www.debian.org/doc/manuals/refcard/refcard.en.pdf
  2. https://cht.sh
  3. https://devhints.io/
  4. https://www.cheatsheet.wtf/
  5. https://www.google.com/search?q=debian+cheat+sheet+wallpaper
  6. https://github.com/hofmannedv/cheatsheets