I would get a rapsberry pi and at first put it behind your provider’s firewall to make sure only specific ports are open to the internet (ideally none at first)

I would get a rapsberry pi and at first put it behind your provider’s firewall to make sure only specific ports are open to the internet (ideally none at first). Then i’d link all my home devices to that rpi and configure it to manage routing, at first with dhcp and then manual static ip addresses. Maybe add a bit of bandwidth throttling per device just for fun, and bandwidth monitoring and reporting. For hosting git and such i’d install gitlab and maybe for photos i’d add an external us device for file storage and perhaps a shared mount.