====== Vim Editor ======
===== Cursor movement commands =====
    h     move the cursor one space to the left
    j     move the cursor one space down
    k     move the cursor one space up
    l     move the cursor one space to the right
===== Deleting text =====
    x     delete the character at the cursor
    dd    delete a line    
===== File saving =====
    :w    save (write to disk)
    :q    exit
    :q!   quit and not save
===== Modifing Text =====
    a           Append some text from the current cursor postion
    A           Append at the end of the line
    i           Insert text to the Left of the cursor
    I           Inserts text to the Left of the first non-white character
                    on current line
    o           Open a new line and adds text Below current line
    O           Open a new line and adds text Above the current line
===== undo the chages =====
On occasions you may need to undo the changes. The following commands restore the text after changes.
    u           Undo the last command
    U           Undo the current line from all changes on that line
    :e!         Edit again. Restores to the state of the last save
===== Other commands =====
  Go to line on Vim: First enter the number of line and press "shift + G"