Today I had to include a router in our home for to my daughter to use her office toplap at home.
Never knew of local or worldwide settings of network.
Yeah... being a hero ... I didn't read anything and just started trying to launch it.
It took me 4 or 5 hours until I realised the router is an Internet device too and have just to use the MAC and IP address of my ISP on it.
I had a success but given I've read the Wikipedia, for example, I'd do it in half an hour.
So please don't be such a hero like me - RTFM men!