OK, so what you probably won't get much out of would be load balancing knowledge, from your description the CPU far outpaces everything else you have running services today. To get a good handle on that sort of thing, its handy to have comparable hardware for each node.

But the CPU is more than enough for most general task services, so yeah that will do fine. In terms of the GPU, yes, that will work for AI tasks as far as I know, most of the hardware I'm using for that is work stuff I get my hands on, so I couldn't tell you much about the performance of the 3070 specifically, and I doubt a 6000 Ada as a reference w9uld be helpful, so maybe others can chime in on that aspect.

Since its mostly for learning, yeah, go for it. If you want to run i5 24x7, I'd probably want to separate out some of that CPU from that PSU purely for power management/cost to run, but yes its more than adequate for most services you'd throw on there.

Most of the servers I'm running are using a CPU that came out about 5 years before that Ryzen, but they are also lower wattage systems. Since they dont need a ton of CPU at all times, this is more the ideal for continually running home services, but not the only way to do it.

So build away and enjoy