Where do I learn more about audio stuff?

You can also read "Good Sound" by Laura Dearborn. This is an uncomplicated book that is written for the newbee/novice. Robert Harley's book is excellent also, but assumes the reader knows a little about audio.

There are many other audio-related forums. Each has their flavor. Here are a few:

http://www.audioasylum.com/index.html

http://www.audiocircle.com/circles/index.php?PHPSESSID=0clpiflfd3ua0qlmpnlt1beqr7&action=circles

http://audioroundtable.com/

audioreview.com is pretty good also for getting a range of opinion on specific pieces.

In an abundance of caution, and by way of a disclaimer, you are hereby forewarned that Audiophilia is severely habit forming. There is no known cure for this obsessive/compulsive disorder other than a total loss of hearing. Before you proceed, further consider that none of us are able to save you once you have entered the realm of fantasy and the fantastic. Audio Manufacturers are known to prey on our weakened condition and fleece us of our hard earned cash with lavish promises of a new nirvana.
There are other rewarding hobbies you may wish to consider instead such as stamp collecting and gardening both of which may be considerably less addictive. Should you be predisposed to Audiophilia and succumb to its capricious whims please take note that this Support Group is open 24/7. Intervention is available.

search the forums here for basic questions, then read the strings, it will go fast, and sometimes be funny has hell.