change ssh port to make it secure

we can remote another computer on same network using ssh, but if there is someone else who knows the password on the computer so he can also do remote acces to the computer. so we have to change some settings by replacing the existing ports so other people will not easy to access the destination computer

1. open file sshd_config
   sudo nano /etc/ssh/sshd_config
2. find text
   Port 22
   change with
   Port 2222 / another port number
3. find text
   PermitRootLogin yes
   Chenge with:
   PermitRootLogin no
   this setting will not permit root as default login
   5. save by
   ctrl+x press y then enter
   6. restart ssh lo
   sudo /etc/init.d/ssh restart