Caching Strategies — Redis, CDN, Browser, App Layer
Master every caching layer from browser to database, understand invalidation strategies, and implement cache-aside and write-through patterns.
There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors. The joke lands because cache invalidation genuinely is one of the hardest problems in system design. But caching itself is the single most effective tool for making systems fast and scalable.
A well-implemented caching strategy can reduce your database load by 90%, cut response times from seconds to milliseconds, and save thousands of dollars in infrastructure costs. This lesson covers every caching layer, when to use each one, and the invalidation strategies that keep your data fresh.
The Caching Layers
A request passes through multiple potential cache layers before hitting your database:
User Request
│
▼
┌──────────────┐
│ Browser Cache │ Layer 1: Cached This lesson is part of the Guild Member curriculum. Plans start at $29/mo.