#caching

Implement caching with Redis. Patterns: 1. Cache-aside (lazy loading). 2. Write-through (update cache on write). 3. Write-behind (async cache updates). 4. Cache invalidation strategies. 5. TTL for automatic expiration. 6. Key naming conventions. 7. Data structures (strings, hashes, lists, sets). 8. Pub/Sub for real-time. Use for session storage, rate limiting, leaderboards. Monitor memory usage.