SSH key creation

$ ssh-keygen -t ed25519

Generating public/private ed25519 key pair.
Enter file in which to save the key (/home/USERNAME/.ssh/id_ed25519):

enter a passphrase

Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/USERNAME/.ssh/id_ed25519_test.
Your public key has been saved in /home/USERNAME/.ssh/id_ed25519_test.pub.
The key fingerprint is:
SHA256:SHA256-HASH USERNAME@HOSTNAME
The key's randomart image is:
+--[ED25519 256]--+
|.................|
|.................|
|.................|
|.................|
|.................|
|.................|
|.................|
|.................|
|.................|
+----[SHA256]-----+


copy SSH key to remotehost

ssh-copy-id username@remotehost

or manually copy .ssh/id.ed25519.pub into .ssh/authorized_key on your remotehost