Add an example custom widget to the WordPress Dashboard

wp-example-custom-dashboard-widget.php

function project_add_dashboard_widgets() {
  wp_add_dashboard_widget(
                'project_hint_dashboard_widget',         // Widget slug.
                'Title Here',                     // Title.
                'project_hint_dashboard_widget_function' // Display function.
  );
}

//this function matches the display function in the above code
function project_hint_dashboard_widget_function() {
    echo '<p>Put your instructions here!</p>';
  }

add_action( 'wp_dashboard_setup', 'project_add_dashboard_widgets' );