Ask HN: What are good resources to learn about managing your own infrastructure?

I'm a backend developer and would like to learn about what goes into managing your own infrastructure e.g. dedicated servers in a co-located datacenter.

Let's say I buy 10 servers on Hetzner, what are my next steps? How do I secure these servers (networking, access management), what to use for monitoring, how best to deploy software?

Any books or articles you can recommend? A checklist?

What additional topics come into play if it were 100 servers, what about 1000?