Omarchy OS: How do I manage SSH keys?
Keep your private key in ~/.ssh and install its public key on the systems you access.
Use ssh-keygen -t ed25519 to create a key pair if you need one; protect the private key and share only the .pub file. If you want other computers to SSH into your Omarchy machine, Setup > Security > SSHD enables the server and its firewall rule.
Source: Omarchy manual.