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Remove wordpress menu and logo from admin panel.

Learn how to remove the WordPress logo and its submenu from the admin bar with one simple hook added to your theme’s functions.php file.
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Ajax login WordPress.

Learn how to build an AJAX login form in WordPress so users can log in without reloading the page, using admin-ajax, a custom handler and jQuery.
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Cron Job WordPress (WP-Cron)

What WP-Cron is and how WordPress schedules time-based tasks, with an example of how to add and schedule your own custom cron event in WordPress.
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Disable Plugin Update Notification.
Learn how to disable update notifications for specific WordPress plugins, such as heavily customised WooCommerce or Dokan, to avoid losing changes.