Does port mapping (for minecraft) compromise the security

Hi,
My son wants to install the minecraft server on his laptop, so he and his brothers can play in one world.
I did find the information how to forward ports, but I am a little reluctant to do so, because I don't know how save it is. Does port mapping compromise the security of my network? Would this open a backdoor for hackers to invade all computers conneted to the network?
I would apreciate any advice.

No, not if done properly.
Generally, port mapping is designed to allow a direct connection from the Internet to a specific computer running a specific service on the local network. In this case the specific computer is your son's laptop and the specific service is the Minecraft server. Any other computers and services on that local network, other than your son's laptop will remain off limits to the Internet.
The key to making sure that this stays secure is that you assign the laptop a static IP address, so it is the only one that is directly addressable from the Internet, and only the ports required for the Minecraft server are mapped to that static IP address belonging to the laptop.

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