VI Editor Tips for beginners

There are two modes in VI editor
command mode and escape mode

Press to enter in command mode
Press "i" to enter in insert mode

Delete-dd
Press

to delete one line
x
Delete one character
:wq
Save and exit

:q!
Quit without saving
^Z
suspend vi

ZZ
writes and quits at the same time
:r name
reads in the file name at the cursor point
copy and paste (yy and p) Yank

yy
yanks into a temp buffer
p
paste the yanked file

Search
==> /pattern
searches for the pattern in the file
n
carry search in the same direction
N
carry search in opposite direction

UNDO command
u
undo the last action
.
repeats the last command