Tina guides viewers through the process of increasing their websites or funnels' security by explaining and implementing various security-related HTTP headers. She simplifies the concept by comparing a website to a house that needs protection from hackers, akin to burglars. Key security headers highlighted include Content Security Policy (DCSP), XFrameOptions, Strict Transport Security (HSTS), X-XSS-Protection, and X-Content-Type Options, each providing a layer of defense against different types of web attacks. The tutorial includes step-by-step instructions on accessing the security tab, adding security headers, and understanding their functions to protect user data and ensure safe, encrypted communication between the visitor and the website.