I'm with Pete here.
Buy an Edgerouter-x for your primary home firewall/router. Then decide what you want for WiFi - I've been using Unifi APs for nearly a decade with little to no issues.
As for your learning - physical hardware is really mainly good for learning hypervisors, beyond that you could do everything in a VPS provider like Vultr. No upfront fees, no power drain on you at all. I'm not sure what they offer on the networking side, i.e. you setting up your own private network playground where you setup a router on the edge, etc... but the other typical server stuff they can definitely provide like any other VM would.