Tips: Vi Editor Usage

:q!     abort without saving
:wq     write changes and quit

a       append text after cursor
i       insert text before cursor
o       open a new line below current line
O       open a new line above current line

x       delete character
dd      delete line
1p      restore most recently deleted text at cursor
u       undo last change (repeat to undo undo)

10G     go to line 10 (can use any line number)
G       go to last line
0       move to beginning of current line
$       move to end of current line"