How to put a computer behind a router?

Question

network hardware

There is a WAN, an external IP, a router and a LAN behind the router. There was a need to put the internal computer outside in order to access the external network (shared resources). How can I do this with a router? In what direction to dig?

Answer 1

NAT, DNAT. Port forwarding, port-triggering, port-forward or whatever it is called in your hardware.

Answer 2

DMZ
or static routing prescribe