Caching Strategies Caching is the most commonly misapplied performance technique. The failure mode is not "cache too little" — it is "cache without an invalidation strategy and then discover the problem in production six months later when users complain about stale data that you cannot explain." When to Use ✅ Use for: - Choosing which caching pattern fits a use case (cache-aside, write-through, write-behind) - Designing TTL values for different data freshness requirements - Implementing Redis caching patterns: sorted sets, pub/sub invalidation, Lua scripts - Configuring Cache-Control headers,…