Be prepared for your router to not work until you figure out how to set stuff up. So hopefully this isn’t your only router. I converted a router to OpenWRT and my knowledge of networking was super basic. It was very confusing but I did get it working in a few days. However, I couldn’t get some things working like a VPN or updating without wiping all my settings. OpenWRT is router firmware, not NAS software. You’ll need to run something like CasaOS, OpenMediaVault, TrueNAS, etc for that.

This website is a great starting point for router configurations: routersecurity.org/#StartHere