SSH as in Secure SHell in the words of wikipedia:
Secure Shell (SSH) is a cryptographic network protocol for secure data communication, remote command-line login, remote command execution, and other secure network services between two networked computers. It connects, via a secure channel over an insecure network, a server and a client running SSH server and SSH client programs, respectively.
Its great. Its awesome. Its fantastic. Its the best thing since the sliced bread…
pacman -S openssh
systemctl enable sshd
systemctl start sshd
By default sshd uses port 22. Make sure that its open in Your firewall.
Now go to Your other machine and type in:
ssh -p 22 -l loginTOtheREMOTEmachine ipORhostname
Port, login and ip / hostname can vary but in general the command should look something like this:
ssh -p 22 -l andrzejl 192.168.0.100
If You did everything properly – You should see a password prompt from the remote machine. Type in the password. There… You are now in control of the remote computer.