Making Custom Widget

Have a look at the Widgets API.

Rupam, here’s a simple dashboard widget to get you started. I wrote this so contributors to a client’s site could easily return to the main website…

<?php
/**
 * @package Back to Website
 * @version 1.0
 */
/*
Plugin Name: Back to Website
Plugin URI: https://compusolver.com
Description: Back to website widget.
Author: Hank Castello
Version: 1.0
Author URI: https://compusolver.com
*/

function register_cs_hm_dashboard_widget() {
 	global $wp_meta_boxes;

	wp_add_dashboard_widget(
		'cs_hm_dashboard_widget',
		'Back to Website',
		'cs_hm_dashboard_widget_display'
	);

 	$dashboard = $wp_meta_boxes['dashboard']['normal']['core'];

	$my_widget = array( 'cs_hm_dashboard_widget' => $dashboard['cs_hm_dashboard_widget'] );
 	unset( $dashboard['cs_hm_dashboard_widget'] );

 	$sorted_dashboard = array_merge( $my_widget, $dashboard );
 	$wp_meta_boxes['dashboard']['normal']['core'] = $sorted_dashboard;
}

add_action( 'wp_dashboard_setup', 'register_cs_hm_dashboard_widget' );

function cs_hm_dashboard_widget_display() {
	?>
        <h2>To return to website:</h2>
	<p><a href='/'><img src='/wp-content/plugins/cs-hm-widget/home320px.png'></a></p>

	<?php
}