First thing to do after creating a new VPS server: setup deploy user and enable SSH-key authentication only
0) If after creating a VPS server you received a root user password, it’s recommended to change it. To do it, login to the server as root and type $ passwd command. Save a new root password somewhere so you will not forget it.
1) Create on the remote server a deploy user:
# on the server, as a root user
$ adduser deploy
$ adduser deploy sudo
2) Make sure that you can login to the server as a deploy user without password prompt: