#save changes in vi editor
by press i you can `Insert` anything. After finshing changes then press :(colon)
and type wq!
syntex : wq!
Explanation : The ex mode is an extension of command mode. To get into it,
press Esc and then : (the colon).
The cursor will go to the bottom of the screen at a colon prompt.
Write your file by entering :w and quit by entering :q.
You can combine these to save and exit by entering :wq.
However, if you're finished with your file, it's generally more convenient to type Shift-z-z from command mode.

vim filename #open file in vim
//To insert text press i and you can start editing
//Press Esc key and type :wq to save a file AND exit
//Press Esc key and type :w to save WITHOUT exiting

//Save
:w
//Exit
:q

// Save & exit(quit)
:wq

//SAVE
:w
//SAVE AS
:w <new filename>
//EXIT - exit without saving
:q!

// Save a new file (if you have entered vim without first creating a file)
:w <filename>
// Save file and exit
:x

Editing a file in a VIM editor