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To anyone who is having trouble with the technical aspects of these, there's an excellent series of FREE videos for computer security available here:

Professor Messer's Free CompTIA SY0-301 Security+ Training Course | Professor Messer - CompTIA A+, Network+, Security+, Linux, Microsoft Technology Training

Sanantone brought up that these would be good for preparing for the Network+ and Security+ certifications, and yep, he's right. The material meshes nicely some of the Security+ basics.
Some of basic material can also be found in Professor Messer's A+ prep course:

Professor Messer's Free 220-70x CompTIA A+ Training Course | Professor Messer - CompTIA A+, Network+, Security+, Linux, Microsoft Technology Training