Id recommend setting up a domain even if just for local use. No-ip.com is at least working for me right now (my router is keeping my dynamic ip dns records up to date so i can wireguard into my router/lan even if the ip changes).

You dont need to expose your services but if you ever do want to, it’s so much easier if youve got a working reverse proxy infront already set up plus you can use https.

Setting up (sub)domains in lan forces you to learn to use a reverse proxy like caddy traefik or nginx. Personally to me NPM(nginx proxy manager) was the easiest to use but i use caddy nowadays. For half a year i didnt expose anything but after wanting to share some albums with the extended family i decided to do so via pangolin hardened with crowdsec running on a virtual private server. Pangolin - while not as easy as crowdsec - was very well dockumented and works well.