Definitive Guide to Nmap: How it Works & Scanning Basics - Updated 2022
Router Hack - How to hack ADSL router using NMAP - blackMORE Ops
File:Nmap OS detection.png - Wikimedia Commons
This scan from out side to my ip , my router is Edgerouter with no port forwarding rules,How & what ports should i close since i did not enable any of those,