Drupal's caching system is powerful, but caching bugs are some of the hardest problems to diagnose. In this hands-on half-day training, you'll work through the full stack — from cache tags, contexts, and max-age through fragment caching, Dynamic Page Cache, Page Cache, and CDN integration. You'll practice debugging real caching issues using development settings, response headers, and direct cache bin inspection, and leave knowing how to write cache-aware code that doesn't quietly break things. Prerequisites: experience building Drupal modules or custom themes; bring a laptop with a local Drupa