I still remember the IPs for the DNS servers at a place I worked at in the 1990s. If you don’t end up remembering IPs at least for a while you aren’t really get

I still remember the IPs for the DNS servers at a place I worked at in the 1990s. If you don’t end up remembering IPs at least for a while you aren’t really getting your hands dirty. But yeah all those seem like good learning opportunities. If you don’t actually need email that much, running your own mail servers and DNS servers is also good, altho in the modern day some large providers will probably regard your outgoing mail as spam. (E.g. I can’t email my wife on ATT.net, and from time to time I have been blocked by gmail and office 365).