From Linuxhaxor.net, the top 3 tips: Are there any other tips you think should have been included or that you found to be true?
The following is a list of rules and tips you might find useful in dealing with basic security concerns:
1. Avoid doing your regular jobs when you are logged in as root. This reduces the risk of getting a cuckoo egg or a virus and protects you from your own mistakes.
2. If possible, always try to use encrypted connections to work on a remote machine. Using SSH (secure shell) to replace telnet, ftp, rsh, and rlogin should be standard practice.
3. Avoid using authentic method based on ip address alone.
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