Where i should not use if (!defined(‘ABSPATH’)) { exit; }?

The point of that code is to prevent any PHP inside the file from being executed if the file is accessed directly outside a WordPress context. ABSPATH is defined by WordPress, so if it’s missing when the file is accessed you can tell that it’s not running in a WordPress context.

So the only place you wouldn’t use it is in any file that you did need to access directly. There probably shouldn’t be any such files in a WordPress theme or plugin. The most common example might be a file for handling AJAX requests, but in WordPress you should be using admin-ajax.php or the REST API for that sort of thing.

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