some basics of Vi editor

Open a Vi editor
Press"I" toinsert the data
for saving a file
press
(esc):W filename.txt

Move the cursor around the screen

h - Cursor left
j - Cursor down
k - Cursor up
l - Cursor right

deleting single line and single word from the Vi editor

Delete single word by moving the cursor on that word and switch the cmd to command line

i.e (esc) then press X

y	Copy current line

Ctrl-F	Forward one screen	cw	Change word
Ctrl-B	Back one screen	cc	Change line
Ctrl-D	Down half a screen	C	Change from current position to end of line
Ctrl-U	Up half a screen	dd	Delete current line
Ctrl-E	Display another line at bottom of screen	ndd	Delete n lines
Ctrl-Y	Display another line at top of screen