add wp shortcode code apper in place

add wp shortcode code apper in place.php

<?php
    function shortcode_function_name() {
        ob_start();
        // Code
            ...youre php/html code
        
        $content = ob_get_clean();
        return $content;
                                     
    }
    add_shortcode( 'shortcode_name', 'shortcode_function_name' );
?>