Caching strategies for user-facing data? like, what should we do? dont want slow pages.

Hey everyone, I'm trying to figure out the best way to cache frequently accessed user data. We're seeing a lot of repeated read operations for things like user profiles and settings. What are your preferred strategies? Are you mostly using in-memory caches, distributed caches like Redis, or something else? Any specific patterns you find particularly effective for managing cache invalidation when the underlying data changes?