Take control of Cache-Control and local caching

This document explains the HTTP Cache-Control header and browser caching, detailing directives like **no-store** (prevents any caching), **no-cache** (requires revalidation despite caching), **public**, **private**, **max-age**, and **must-revalidate**. It dispels common misconceptions (notably that no-cache does not block caching), and provides practical examples and guidance to balance performance and security: use **no-store** for sensitive data, **private** with short revalidation for user-specific but non-sensitive content, and **public** caching with longer lifetimes for generic static assets.