I viewed a few tutorials, most of which were of little use to me because I own a Mac, which is the only device I have control over. So, learning information of a trivia nature is less motivating knowing that I can't really implement any of it. While I work in a PC environment, I do not have administrative rights to make any of these changes (or download any software).
The Wireless Networking setup tutorial had a couple tips that I didn't use much. Not broadcasting my SSID name is one I'll try. I currently am without Internet access, so I guess I'm running a fairly secure setup. I don't know that I'd share this information, as I currently am using it to wardrive my community in search of default username/password combinations which will allow me to access my online class (for as long as my laptop battery will last at 35 degrees).
I've been dissatisfied with the default Windows Backup utility since Windows 98. It was nice to hear that there are free tools which perform the same tasks (Karen's Replicator backup). The fact that one can customize when and how much of a backup is done is very useful. Some of my files I need backups of more frequently than others. Video files change very little after completion, but my gradebook changes sometimes hourly.
I was fascinated by the Intrusion Detection and Prevention software and, again, was pleased that there were free versions (if only for PCs) which might allow me to identify when/if intrusion is happening. If I can find equivalent Mac versions, I am interested in checking it out.
Overall, these tutorials were superficially instructive. However, their dated (2006) content makes the value of any information largely suspect. As fast as technology changes, a 5-6 year old tutorial is at best anecdotal or amusing.