How to connect computers by nc!

Install netcat.

You have 2 options:

If it is your first contact with netcat I recommend

yay -S gnu-netcat

Now on first device start listening on port, for example 1234

nc -l 1234

And on second connect giving IP and PORT from first device

nc 192.168.27.91 1234

Now you can paste any text and confirm by ENTER to send it instantly to second computer.

It is important that you have to be in the same network, and some networks can block traffic between devices if they are properly configured. It it will not work you have to check your iptables, for example using ufw that is interface for iptables and simplify configuration.