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Enter same passphrase again:

Your identification has been saved in /home/user/.ssh/id_rsa.

Your public key has been saved in /home/user/.ssh/id_rsa.pub.

The key fingerprint is:
f6:61:a8:27:35:cf:4c:6d:13:22:70:cf:4c:c8:a0:23 user@localhost

The command ssh-keygen -t rsa initiated the creation of the key pair.Adding a passphrase is not required so just press enter.The private key gets saved in .ssh/id_rsa. This file is read-only and only for you. No one else must see the content of that ...

Create .ssh dir on remote host(The dir may already exist,No issues):

user@localhost>ssh user@remotehost mkdir -p .ssh
user@remotehost's password: 

Append user's new public key to user@remotehost : .ssh/authorized_keys and enter user's password:

user@localhost>cat .ssh/id_rsa.pub | ssh user@remotehost 'cat >> .ssh/authorized_keys'
user@remotehost's password: