// Add Custom Dashboard Widget
function add_custom_dashboard_widgets() {
  wp_add_dashboard_widget(
    'my_custom_widget',
    'My Custom Widget',
    'dashboard_widget_function'
  );
}
add_action('wp_dashboard_setup', 'add_custom_dashboard_widgets');

function dashboard_widget_function() {
  // Display whatever you want to show.
  echo "Hi WordPress, I'm a custom Dashboard Widget from wp-skills.com";
}