Practical vi Techniques

Although many places have iterated vi common commands, one may still come across with obstacles to maneuver comfortably.
The following is an ongoing list which I consider be worth recording and practicing.

• Syntax Highlight (update your vim if this is not installed as default):
  

  sudo apt-get install vim
  :syntax on, :syntax off
  

• Undo (one can undo multiple steps with the newer version)

  u

• Replace (refer advanced regex skills):

  :s/foo/bar/g

• Search by keyword

  /keyword

• Go to the first line, last line, head of line, end of line

  1G, G, 0, shift+4
  

• Backward or forward by one word

  b, e

• Go to line n

  :n

• New line with input mode (on next line, on previous line)

  o, shift+o

• Multiple lines cut-and-paste, copy-and-paste

  ndd+p, nyy+p
  

• Copy-and-paste from clipboard (using the shortcut of terminal window)

  ctrl+shift+c, ctrl+shift+v

• Set line number and unset

  :set nu, :set nu!

• Save the file often, override even when complaining read-only permission

  :w, :w!