Some tips to bare in mind once Linux is installed.

• Setup SSH on a different port than 22
• Only use protocol 2 (SSH)
• Webmin is a powerful linux web based management tool, use 'yum install webmin' to configure
• Always setup an alternative account to root, and use the alternative to login
• Disable root login via SSH
• To elevate your permissions to root once logged in type 'su -' and enter the root password
  

That concludes our short 5 part introduction to Linux

Cheers
Ryan Partington