I just try to make everything as self documented as possible. Eg. no stray scripts, everything is either implemented in other software (eg. my main wireguard peer in systemd-networkd, without any non-obvious external dependencies) or tracked as a part of an arch pkg with a simple PKGBUILD. I usually either have very simple nets (eg. my VPN’s net only consists of four peers, in the order main - secondary - laptop - phone) or leave it to DHCP and SLAAC. I try to avoid using ports for local servers as much as possible and use unix sockets. Stuff like LVM/Luks pretty much documents itself.