The idea of this trick is to add ?ver=filetime to the end of the address to the style file.
After each edit of the file, we will get a different time of the file and will change the name of the style file for the browser.
The browser will reload the file.
People won’t crash and won’t have cache problems! Use it
function boxstyle_styles() {
$style_ver = filemtime( get_stylesheet_directory() . '/style.css' );//we will use a standard php function that will check the time of creating or editing the style file
wp_enqueue_style( 'boxstyle-style', get_stylesheet_directory_uri() . '/style.css', '', $style_ver );//write this time at the end of the css file
}