Normal mode
                 -----------

  Editing:

    i,I,a,A - go into insert mode
    dd      - delete line
    >>      - indent line
    <<      - dedent line
    ~       - switch case
    d<move> - delete something
    c<move> - delete and go into insert mode
    r<char> - replace with <char>

  Repetition:

    <number><command> - do it number times
      e.g. 20w means go forward 20 words