What are the best ways to handle cache invalidation when you need real-time data? Like, what are the best practices?

hey were havin some stale data probs lately, esp user content that changes fast. were usin redis for cache but our invalidation logic feels kinda manual and prob error prone. what are your go to strategies for keepin caches in sync w/ fast changing data without messin up performance. any specific patterns or tools u found effective beyond simple ttls