I'm sure there's been a post like this already, but I am currently trying to find ways to practice stuff at home while not breaking the bank. I am using cisco Packet tracer for testing and playing around and I've been thinking about buy a Raspberry Pi or two. I'm just curious if there is anything in addition I could do until I have more money to but some nicer stuff.
Get a used PC, haswell or newer. Those can be found for less than 50 €. Upgrade it to 16 gb ram, install proxmox.