List out hook in wordpress.

Hooks in WordPress are functions that allow developers to modify or add functionality to WordPress without changing the core files.

There are two main types of hooks:

A. Action Hooks

Action hooks are used to execute a function at a specific point in WordPress.

Common Action Hooks:

1. init
2. wp_loaded
3. wp_head
4. wp_footer
5. admin_init
6. admin_menu
7. admin_enqueue_scripts
8. wp_enqueue_scripts
9. save_post
10. publish_post
11. login_init
12. user_register
13. comment_post
14. widgets_init
15. after_setup_theme

Example:

function my_function() {
    echo "Hello WordPress";
}

add_action('wp_footer', 'my_function');

B. Filter Hooks

Filter hooks are used to modify or change existing data before it is displayed or stored.

Common Filter Hooks:

1. the_content
2. the_title
3. the_excerpt
4. the_permalink
5. the_author
6. wp_title
7. body_class
8. post_class
9. excerpt_length
10. excerpt_more
11. upload_mimes
12. login_redirect
13. comment_text
14. widget_text
15. document_title_parts

Example:

function change_title($title) {
    return $title . " - My Website";
}

add_filter('the_title', 'change_title');

Difference

In short:
Action = Do something
Filter = Change something