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I’ve learned a number of tools I’d never used before, and refreshed my skills from when I used to be a sysadmin back in college. I can also do things other people don’t loudly recommend, but fit my style (Proxmox + Puppet for VMs), which is nice. If you have the right skills, it’s arbitrarily flexible.
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What electricity costs in my area. $0.32/KWh at the wrong time of day. Pricier hardware could have saved me money in the long run. Bigger drives could also mean fewer, and thus less power consumption.
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Google, selfhosting communities like this one, and tutorial-oriented YouTubers like NetworkChuck. Get ideas from people, learn enough to make it happen, then tweak it so you understand it. Repeat, and you’ll eventually know a lot.
I don’t see this mentioned there, but that Apple has largely ignored enterprise works out as a strength; other companies wrote and open sourced pretty good tools. That can result in tools that better meet your needs, and generally will result in a lower TCO.