vim not save saving file in linux code example

Example: exiting vim

Press Esc key: This is very important, because you must exit the edit mode first before typing the exit command(s). Next, you can type one of the following commands:
:q (yes, the colon is included in the command) – This will quit the editor
:q! – Quit Vim without saving the data file
:wq – Save the file and exit Vim
And then press the Enter key