jQuery( document ).ready(function() {
	jQuery( "#submit" ).click(function() {
		 jQuery.post( "https://yoursite.com/yourpage.php", jQuery('#form').serialize())
			.done(function( data ) {
			alert(data);
		}); 
		return false;
	});
});

https://www.catswhocode.com/blog/jquery-and-ajax-ready-to-use-code-snippets-for-every-day

Here’s a super handy snippet that I use very often. It works very simply: once the user clicks on #submit, the data from #form is serialized and sent to a remote page using the POST method.

Get all values from form and send it to a page via Ajax

form, ajax

jQuery