Hello. I'm nothing close to a sysadmin and I have no idea how to use iptables or anything of that sort.
What I do know is that I just had to replace the firmware on my router from its stock firmware (LinkSys Smart Wifi, it's a WRM1900ACS) to LEDE because I'm getting a lot of fishy incoming connections all to the same port that the old firmware didn't have an option to block.
Now I'm stuck though. I can figure out blocking any incoming connections that use the port, but I don't know anymore how to find incoming connections. On my old firmware, there was a simple tab that showed recent incoming connections and what port they were trying to connect to. It looked like this:
If I were able to get this functionality in LEDE somehow, it would be immensely helpful (and be the entire reason I got LEDE in the first place).