create User

1. sudo useradd -m -s /bin/bash -G sudo xxx
2. sudo passwd xxx

-s select the exactly bash
-G select the attached group .
In generally, we only select the sudo

send the key

1. if you did not have the rsa key. then create one by
   ssh-keygen
2. send it to the remote server by
   ssh-copy-id -p port user@remote ip

For Convenient link

1. enter the directory of .ssh
   cd .ssh
2. make file of conig
   touch config
3. write the message of your remote computer

- vim config
- i
-
Host hostname for your any name you like 
        HostName remote_ip
        User username
        Port port
Example:
Host ahhhha
        HostName 183.183.183.183
        User aaa
        Port 22
- :wq