How to copy ssh key to new system?

Question

SSH

I have my laptop in which I have access to the server via ssh, I recently decided to switch completely to a stationary computer and simply copied the .ssh folder to access the server, but I couldn’t get access in this way, an error occurs

The authenticity of host 'имя хоста' can't be established.
ECDSA key fingerprint is SHA256:UUDyM0F3U3WU/Pkdrsdfo4aZxecdsffFpeyM5ZtQKpp5Qn3d7k.
Are you sure you want to continue connecting (yes/no)?

Tell the newbie if it is possible to somehow duplicate the ssh key on the second computer so that it would be possible to get access from it?

Answer 1

After copying, it is necessary to set the permissions of the key to 600
chmod 600 ~/.ssh/id_rsa
Well, as noted above, you must accept the host as trusted by pressing "yes"

Answer 2

Are you sure you want to continue connecting (yes/no)?

What if you just type "yes"?

Answer 3

$ cat ~/.ssh/id_rsa.pub | ssh [email protected] 'cat >> ~/.ssh/authorized_keys'
or use ssh-copy-id from ssh folder