Shortcuts and Cheat sheets

Bash Scripting Cheat Sheet

https://devhints.io/bash

Emacs Edit Mode Keyboard Shortcuts

http://www.catonmat.net/download/readline-emacs-editing-mode-cheat-sheet.pdf

Emmet Cheat Sheet

http://docs.emmet.io/cheat-sheet/

IntelliJ Keyboard Shortcuts

https://www.jetbrains.com/help/idea/keyboard-shortcuts-by-category.html
https://www.jetbrains.com/help/idea/keyboard-shortcuts-by-keystroke.html
https://www.jetbrains.com/help/idea/adding-deleting-and-moving-code-elements.html
https://www.jetbrains.com/help/idea/navigating-through-the-source-code.html

Mac Keyboard Shortcuts

https://support.apple.com/en-us/HT201236

Markdown Cheat Sheet

https://guides.github.com/pdfs/markdown-cheatsheet-online.pdf
https://daringfireball.net/projects/markdown/basics

Scala Cheat Sheet

http://docs.scala-lang.org/cheatsheets/index.html

Vim Cheat Sheet

https://vim.rtorr.com/