Website rendering techniques have a significant impact on user experience, site performance, and search engine optimization (SEO). Different rendering approaches, including client-side rendering (CSR), server-side rendering (SSR), static site generation (SSG), and hybrid rendering, offer trade-offs between performance, SEO, and user interactivity. Understanding the basics of website rendering, including HTML parsing, CSS processing, render tree construction, layout, paint, and composite stages, is crucial for developers. Modern frameworks like React, Vue.js, and Angular provide robust rendering capabilities that help optimize how and when content appears. Emerging technologies such as Incremental Static Regeneration (ISR), Partial Hydration / Island Architecture, Edge Rendering, and WebAssembly are gaining traction to meet rising performance expectations. By applying practical strategies across SSR, CSR, and SSG, developers can improve performance and user experience. Security considerations in web rendering introduce risks, including data injection, server-side request forgery (SSRF), sensitive API exposure, cross-site scripting (XSS), public API access, content security policy (CSP) weaknesses, expanded attack surfaces, state management leaks, and cache poisoning. Hybrid rendering approaches combine the risks of SSR and CSR and add complexity on top. A modern headless CMS like Strapi provides a flexible backend to power any rendering strategy, supporting client-side rendering, server-side rendering, static site generation, or hybrid rendering methods. By choosing the right rendering approach based on project requirements, developers can focus on building great experiences while Strapi handles the content layer behind the scenes.