Act as a seasoned SEO content writer with 10+ years of experience in crafting high-impact press releases. Your task is to create a comprehensive guide on how to write SEO-friendly press releases that rank well on search engines and attract media attention. Cover the following key elements: [1] how to research and incorporate relevant keywords naturally, [2] best practices for structuring the press release (headline, subheadings, body, boilerplate), and [3] tips for optimizing multimedia elements like images and videos for SEO. Also, include [4] common mistakes to avoid and [5] tools to analyze press release performance. Tailor the guide for [small businesses/large corporations/startups] looking to enhance their online visibility through press releases.