Root user is the most authoritative user on linux operating systems. You can take measure for security with disable root ssh. You can connect to server with other users.
Edit sshd_config
vi /etc/ssh/sshd_config
#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yesNote : “PermitRootLogin yes” is default value. This value allows ssh root login
You have to change parameter and remove # symbol.#LoginGraceTime 2m
PermitRootLogin no
#StrictModes yes
Edit Port
Note : You can change ssh connection port, then you can provide extra security.
vi /etc/ssh/sshd_config
#Port=22Change port number
Port=2234
Restart sshd Service
service sshd restart