Act as a senior JavaScript developer with 10+ years of experience in web development. Explain how to use the Fetch API in JavaScript to make HTTP requests, including [GET, POST, PUT, DELETE] methods. Provide detailed code examples for each method, covering [error handling, response parsing, and async/await syntax]. Also, discuss common pitfalls such as [CORS issues, network errors, and handling JSON responses]. Ensure the explanation is beginner-friendly but includes advanced tips for optimizing performance and readability. Use real-world scenarios like [fetching user data from an API, submitting a form, or updating a database] to illustrate practical applications.