Examples WordPress of Hooks in Action

More than 200 hooks exist in WordPress. Below you will find a few examples of common hooks in use.
Register a Custom Menu in the Admin

Types of Action and Filter Hooks

The WordPress Codex has two important pages that can help you orient yourself with what hooks are available in WordPress.

WordPress Action Hooks and Filter Hooks

Introduction

This page documents the API (Application Programming Interface) hooks available to WordPress plugin developers, and how to use them.