how to save and close in vim code example

Example 1: vi save and exit

//Save
:w
//Exit
:q

Example 2: vi quit and save

# ESC to start command prompt, then
:q!		# exit vi without saving
:wq!	# exit vi with saving (! means exiting even if file is read only)

Example 3: save and close vim

// Save & exit(quit)
:wq

Example 4: vim save and quit

// Save & exit
:wp