Saffire provides 20 tips for how to ruin a fair website, including using outdated technologies like Flash, having a bad web host, being invisible to search engines by lacking relevant keywords and calls to action, ignoring mobile responsiveness, not updating content, and failing to utilize user-generated content, video, photos, and analytics to engage visitors. The document emphasizes the importance of a user-friendly design, quick loading times, and incorporating current online and social media trends to attract customers.