How to create Custom Menu in wordpress admin panel

// Create a file under the theme folder Yourname.php

/* How to add menu into the admin */

add_action('admin_menu', 'my_menu_pages');
function my_menu_pages(){
    add_menu_page('Show Recodes',  // page name
        'View Resume',  // menu name
        'manage_options',  // not change
        'Second-menu',  //  Page is display to admin panel it is display in url
        'my_menu_output', // function name
        'dashicons-welcome-view-site', // icon url or icon name
         3
         /*
            where to display
            Default: bottom of menu structure #Default: bottom of menu structure
            2 – Dashboard
            4 – Separator
            5 – Posts
            10 – Media
            15 – Links
            20 – Pages
            25 – Comments
            59 – Separator
            60 – Appearance
            65 – Plugins
            70 – Users
            75 – Tools
            80 – Settings
            99 – Separator
            Top ↑
            For the Network Admin menu, the values are different: #For the Network Admin menu, the values are different:
            2 – Dashboard
            4 – Separator
            5 – Sites
            10 – Users
            15 – Themes
            20 – Plugins
            25 – Settings
            30 – Updates
            99 – Separator

         */
        );
}


function my_menu_output() {
    global $wpdb;
    $results = $wpdb->get_results("SELECT * FROM wp_users"); // Query to fetch data from database table and storing in $results
 
    if($results != null)
     print_r($results);

    if(!empty($results))                        // Checking if $results have some values or not
    { 
        echo "
"; // Adding and tag outside foreach loop so that it wont create again and again
        echo "";     
        foreach($results as $row){ 
        $userip = $row->user_ip;               //putting the user_ip field value in variable to use it later in update query
        echo " ";                           // Adding rows of table inside foreach loop
        echo "
ID
" . "" . $row->ID . "
";
        echo "

";        echo "

---

";
        echo " ";        
        echo "
User Login
" . "" . $row->user_login . "
";   //fetching data from user_ip field
        echo "
";        echo "

---

";
        echo " ";        
        echo "
User Email Address
" . "" . $row->user_email . "
";
        echo "
";        echo "

---

";
        echo " ";        
        echo "
Register Time
" . "" . $row->user_registered . "
";
        echo "
";        echo "

---

";
        }
        echo "
";        echo "
";
    }
}

?>


// goto the functions.php add line bottom of the page

require_once('Yourname.php');

// reffer more information

// to icon
https://developer.wordpress.org/resource/dashicons/#share-alt2

// to add_menu_page()
https://developer.wordpress.org/reference/functions/add_menu_page/

// to get result
https://developer.wordpress.org/reference/classes/wpdb/get_results/