How to process a request when a button is clicked?

Question

PHP

There is a form

<form action="" method="POST">
<input type="number" name="start" value="'.$OrderStartCount.'">
<input type="submit" name="start" value="сохранить"></form>

sometimes you need to make changes in the 3rd field, these changes should be entered into the database in the order table in the OrderStartCount field

Answer 1

ajax
You collect all your data from the form, send it to the server, just for this you need ajax and already in another file, more precisely on the server and add it to the database.