I don’t expect much but I found an old pi I bought probably 2016(may of been 2017). It was supposed to be a pi-hole but was never able to get the dns forwarding to work on my modem. It still works but wanted to somehow convert it to a regular distro(it’s based on a micro-SD and I don’t have any more microsd readers). I wanted to set it up as a basic system I could ssh into a terminal. Not expecting anything fancy or even graphic based. A lot of stuff I want to learn/practice “work” on windows but are native to Linux, like vim/neovim nmap gcc etc. Is this feasible? Am I under estimating what’s possible with it?
Raspberry Pi OS is based on Debian. You should be able to do what you’re describing and more by enabling SSH even without changing the OS.
Assuming it’s a Pi 3, Wireguard will work on it, as will Syncthing (useful if you add an SSD) but the interface bandwidth is limited so it can be a bit slow. That may not be too much of a problem though. My cable Internet’s upload speed is limited to 20Mbps, and despite the limited bandwidth both Wireguard and Syncthing are surprisingly useful.