Create Public / Private key pairs
ssh-keygen -t [Type of the key] -b [Number of bits in the key to create]
e.g. ssh-keygen -t rsa -b 4096
Copy public key to remote server
ssh-copy-id -i [path to public key] [username]@[host]
e.g. ssh-copy-id -i keys/sample_public_key.pub firstname.lastname@example.org
Public key is always associated with a user when it gets copied onto the remote server. The default location storing the keys is usually ~/[user]/.ssh/. All public keys are appended to the ~/[user]/.ssh/authorized_keys file.