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1. The WordPress Hook System (Actions & Filters)

Extending WordPress execution flow.

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- Actions (`add_action`): Trigger custom logic at lifecycle events (e.g. `init`, `wp_enqueue_scripts`). - Filters (`add_filter`): Intercept and modify data before it is saved or rendered (e.g. `the_content`).

php
add_action('init', function() {
    register_post_type('portfolio', ['public' => true]);
});

add_filter('the_content', function($content) {
    return $content . '<p>Footer note</p>';
});

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Check your understanding

1. What is the key difference between an Action and a Filter in WordPress?
Actions perform side effects at specific lifecycle points; Filters modify and return data passed to themActions are in JavaScript; Filters are in PHPActions return booleans onlyThey are identical
2. Which hook is used to register custom styles and JavaScript scripts properly in WordPress?
wp_enqueue_scriptsinitadmin_headwp_footer

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