This is super easy.

Pre-requesite: OpenSSH has been installed on the target machine which is default on Manjaro systems.

On the target machine execute

sudo systemctl enable sshd.service
sudo systemctl start sshd.service

On your own machine you can now do

ssh user@lanip

That’s it, this information was gleaned from forum.manjaro.org/t/unable-to-connect-to-my-manjaro-via-ssh/60634