Do you have a particularly complex setup or a typical home LAN with Wi-Fi? If the latter, chances are you did not do anything bad as the defaults are sane and safe. Look over Firewall -> Rules to make sure you aren’t opening any ports that shouldn’t be. Put your phone on a cell network and try to log into your box using your public IPv4 and IPv6 address. Try to run nmap against the same from a remote server (you can get a cheap or free one from Vultr for example). If you have IPv6, try to for example access ssh running on a computer inside your network from the outside, or even just nmap that address.