How to get knowledgeable in linux performance engineering without actually requiring it in production

Hi everyone, I'm a Platform Engineer building and maintaining a cluster-as-a-service platform. Outside of autoscaling configs and right-sizing resource requests and limits, "low-level" performance work isn't really a requirement for us right now, but I would like to become knowledgeable in that topic. I've started reading Brendan Gregg's Systems Performance and I'm really enjoying it. I also have some flexibility at work, so if I wanted to spend time on