Robuta

https://nmap.org/book/osdetect.html
nmap network scanningchapterremoteosdetection
https://nmap.org/book/
From explaining port scanning basics for novices to detailing low-level packet crafting methods used by advanced hackers, this book by Nmap's original author...
nmapnetworkofficialprojectguide
https://nmap.org/book/man-port-scanning-techniques.html
portscanningtechniquesnmapnetwork
https://nmap.org/book/man.html
reference guidechapternmapnetworkscanning
https://nmap.org/book/man-bugs.html
nmap network scanningbugs