Hi
How's about here? I've had a look through the website and it looks quite good.
http://netforbeginners.about.com/cs/internet101/a/inet_handbook.htm
There's no magic to the internet, and the best way to learn more is just to play around on your computer. If there's something you don't understand, you can just write the word on the 'search' bit of Google, and you'll usually get a reasonable explanation.
The problem with classes if you don't know very much about computers, is that you can end up feeling stupid, afraid to ask anything, flustered, and then anything you might have learned given a bit of extra time will have gone over your head. Sometimes it's easier to learn the basics first, so then you'd be able to benefit from a class, if you still wanted to go.
Plus, don't forget that the "know it alls" are secretly insecure!
There is also an book about the learning to use the internet in the 'Dummies' series ("The internet for dummies") , which might be helpful to you. (there are whole series of these books, covering various topics.They can be a bit complicated though, but they cover the basics, in addition to the more complicated things).
Hope this is of some use to you,

Nicola