The Smart Strategy: What to Cache and What Not to Cache

Here's a secret: You can't cache everything!

Imagine trying to keep every single book ever written on your desk - impossible, right? Cache memory is precious and expensive, so we need to be smart about what we store.

The Golden Rules of Caching:

✅ DO Cache:

• Recently published content (like fresh tweets everyone will read)
• Frequently accessed data (like popular user profiles)
• Authentication tokens (checked on every single request)
• Expensive calculations (results that took 5 seconds to compute)

❌ DON'T Cache:

• Data that changes constantly
• Information accessed once in a blue moon
• Stuff that's already super fast to retrieve

Real Example: Twitter

When someone tweets, that tweet will be seen by thousands of followers within minutes. Instead of hitting the database thousands of times, Twitter caches the tweet. Smart, right?

The Pattern Recognition Game

Successful caching is about spotting patterns:

• "Hey, this user profile gets requested 100 times per minute!"
• "This calculation result is used by 50 different features!"
• "Every login requires checking the same authentication data!"

Pro Tip: Great caching is like being a detective - you spot the patterns and optimize for the most common behaviors.