Here's a great nmap cheat sheet from Nathan House of StationX. I've taken some of his courses and found them to be a huge value in the cost to knowledge gained ratio. He's also very helpful when you run into snags. f you really want to dive into nmap for hacking check out the NSE scripting engine. Start with nmap -sV -sC 192.168.1.1 and then maybe check here.
