Ask HN: Resources for a basic understanding of release/operations engineering?

I've been a software engineer at a large company for a bit now, and I've almost completely stayed in the worlds of coding and project planning. Outside of a few critical incidents when I happened to be on-call, I've not had to step into the world of actually configuring and deploying our applications and services, and then maintaining the live instances and servers they live on.

What general-purpose resources (e.g. books, wikis, guides, etc) would you recommend to learn what actually goes into releasing and maintaining server-based applications and services? I know there's a ton of software and solutions in this space that probably vary wildly in terms of usage, so I'm less looking for a "How to Kubernetes with AWS" and more "What are Kubernetes and AWS even for and why would I need them", for example.